You are confused CharismaticLady,
Hebrews 10:25 is in the context, and structural ladder, of Hebrews.
Hebrews 10:25 speaks of two days (the day approaching) (the 7th day the sabbath, at the end of each week and the great comic week-end sabbath, being the Day of the LORD)
Hebrews 10:25 does not say "a" day approaching. It is specific, "the" day. So it is not referring to just "any" and every day of the week.
Heb 10:25 μη εγκαταλειποντες την επισυναγωγην εαυτων καθως εθος τισιν αλλα παρακαλουντες και τοσουτω μαλλον οσω βλεπετε εγγιζουσαν την ημεραν
That the disciples met "daily", even as the Jews before them did, does not equate to obedience to the specifics of the commandment (Exodus 20:8-11) when it says to "work" six days and to "rest" the 7th day.
The body of believers may gather on any and every day with no injunction anywhere found in scripture against such, and in truth they met "daily", "continually", etc (Mat 26:55; Mar 14:49; Luk 22:53, 24:33,36; Acts 19:9) and likewise among the followers of Jesus Christ (Luk 24:51,53; Acts 1:3,9, 2:46-47, 5:42, 6:1, 16:5, 17:11,17; Heb 3:13, etc), but what does that have to do with the "rest" of the 7th day itself as commanded, and exampled, by God?
Just in the book of Acts alone, there are over 78 sabbaths explicitly recorded.
Acts 13:14,27,42,44, 15:21, 16:13, 17:2, 18:4, (20:6, 21:4, 28:14; Paul always waited seven days, so that he could keep the Sabbath with fellow Jews, and Proselytes (see Acts 2:10; 13:26,42-43,44,45-46,47-49, 14:1,2,15-16, 15:17,19,21, 17:17) and preach the gospel upon that sacred day (Acts 17:2), just as Jesus had; Luke 4:16-21).
The book of Hebrews is built upon the ladder of learning system, beginning with the foundation, and building upon each precisely measured truth, in its “therefore”, “wherefore” and “for” statements. For instance:
Hebrews 1, lays the foundation in the eternal unchanging Deity and Co-Creatorship of Jesus Christ, who has a more excellent name than that of the created angelic hosts.
Hebrews 2, then begins with the connecting link to the previous foundation, with its “therefore”, and builds upon the other nature of Jesus Christ, namely that of the likeness of his fallen sinful flesh nature of humanity that He had taken upon Himself.
Hebrews 3, then continues to build upon those two things further, and connects to the past truth, with its “wherefore”, and delves straight into the peoples Israel [sons of natural Jacob] of the past, with Moses as a type of Christ; thus showing that Christ is the greater Moses, and in vs 7, another link “wherefore”, pointing to the failure in faith, and the rebellion of action as the result, drawing a parallel between they of old, and the we of then in Paul's day and so also now.
Hebrews 4, then continues the building exhortation, by its “Let us therefore”, and moves right into an an expanded comparison of the past with the present situation, in matters of living faith, granting the victory over sin. Paul, under inspiration of the Holy Ghost, draws from several passages of scripture, and draws a conclusion, with another link in vs 6, a “therefore” and further throughout with additional conclusions and places to step higher, in vs 14, “Seeing then”, and vs 16, “Let us therefore”. Living faith may therefore climb up Jacob's ladder [Christ Jesus] and reach the Throne of Grace, even “boldly”, to find pardon and cleansing for sin.
Hebrews 5, then takes this point on faith, grace, forgiveness, and cleansing, and takes the next step, pointing out the temporary changing Highpriests of old, and the eternal Highpriesthood of Jesus Christ, who is now, with its “For”.
Hebrews 6, then takes this another step higher, with its link of “Therefore”, and moves into the eternal promises of God and eternal covenant made with Abraham [etc], in Christ Jesus, and that true living and abiding faith in contrast with that which is mere 'fool's gold faith' [I believe, I believe, and no corresponding result, thus draw back into doubt, masking as 'faith'].
Hebrews 7, then going further into detail about how Jesus Christ can be a real Highpriest, is linked to the previous, with its “For this”, demonstrating that Jesus is after a higher order, a more ancient order of priest, the Melchizedek priesthood, to which even Abraham, the father of the faithful, acknowledges by tithe. Paul draws out a conclusion in vs 11, “If therefore” and continues.
Hebrews 8, reaches a midway peak, and summarizes all that has been stated before, with its “Now of the things which we have spoken this is the sum”, and continues by contrasting the shadows of the Levitical with the reality of Jesus' Melchizedical, along with the old and new covenants.
Hebrews 9, begins with the summarized truth, “Then verily”, and shows the contrast of the earthly sanctuary and its recurring animal sacrifices with that of the true Heavenly, with Christ as the real Mediator between God and man, and the one true sacrifice that was foretold from the beginning, which parallels the language of Colossians 2 and Ephesians 2.
Hebrews 10, continues the thought of Hebrews 9, with is “For”, and shows that the Levitical written laws had types, figures and shadows all pointing to their substance, their body, their reality, Christ Jesus, and because we now have the real sacrifice, sins can truly be cleansed, whereas the blood of goats and calves do not do so, and that everyone taking hold of this sacrifice may enter into God's presence through faith in it.
Hebrews 11, then takes us back to the beginning with “Now faith” and “by faith ...” in the Lamb slain from the foundation of the world, and unites the peoples of faith gone before, with those present, and all those yet to come in the redemption and resurrection provided in Christ Jesus.
Hebrews 12, takes this great 'hall of faith', and links to it with “wherefore”, for the now present persons looking at the significance of the death, burial, resurrection and ascension of the Messiah, and continues with the striking difference between the judgments gone before because of transgression/sin, and the great Judgment to come, but not to grow weary and cling to the blessed Hope, which is Christ Jesus.
Hebrews 13, one can hear the echoed “wherefore” of Hebrews 12:28, in that also in vs 29 God is a consuming fire, who is love, and so “Let brotherly love continue.”, and like as Jesus so loved, in Hebrews 13:12, “wherefore” we ought also to follow such an example of love, and thus, chapters 11, 12 and 13, might appropriately be called the chapters of “Faith, Hope & Love”, and the greatest of these is Love.
Look again:
Hebrews 3-4 (among many others; John 14:15; Exodus 20:6; Isaiah 56:1,8; John 10:16; Isaiah 56:2-7, Acts 4:24, 14:15; Revelation 10:6, 14:6-7, &c).
Hebrews 3-4 is clear.
Hebrews 4:3, "my (God's) rest" and "the works were finished from the foundation of the world", which is a direct reference to Genesis 2:1-3. It even uses the word "finished". God rested the 7th day in Genesis 2:1-3. It is His rest, the 7th day, the sabbath (rest) of the LORD thy God, Exodus 20:8-11.
Hebrews 4:4, "he spake in a certain place of the seventh day on this wise, And God did rest the seventh day from all his works", which "certain place" is Genesis 2:1-3; re-cited in Exodus 20:8-11. The 7th day the sabbath (rest) of the LORD thy God.
Hebrews 4:5, "my (God's) rest)", citing Psalms 95, which is citing Genesis 2:1-3; Exodus 20:8-11, etc. Again, this is the 7th day the sabbath (rest) of God at Creation in Genesis 2:1-3.
Hebrews 4:6, "remaineth", from when? "from the foundation of the world" as per Hebrews 4:3 and thus it is not new, but has been around from the beginning.
Hebrews 4:9, "rest", sabbatismos, literally and truly sabbath keeping in scripture and in all known extant Greek sources, dictionaries, and so on and again "remaineth".
Hebrews 4:10, "his (God's) rest", which is the 7th day the sabbath (rest) of the LORD thy God from Genesis 2:1-3., "as God did from his (works)", which "works were finished from the foundation of the world" as per Hebrews 4:3.
Hebrews 4:11, "that rest" (ie God's rest), the 7th day the sabbath (rest) of the LORD thy God.