The Sabbath day is the seventh day. God worked six days and rested the seventh. The seventh day is our Saturday (which is the modern day Jew's Sabbath Day - from sundown Friday to sundown Saturday. The Hebrew day begins at sundown the day prior). Over time, the Sabbath became to be observed by Christians on the first day of the week (our Sunday). But all the wrangling over which day is the true Sabbath Day is moot, for Christ became our Sabbath (our rest), our Passover, our Circumcision (Rom 2:29) and the one time offering for our sin. And even Jesus did many of His works on the Sabbath Day (which got Him in much 'trouble' with the Jews): Matt 12:1-8 1 At that time Jesus went on the sabbath day through the corn; and his disciples were an hungred, and began to pluck the ears of corn, and to eat. 2 But when the Pharisees saw it, they said unto him, Behold, thy disciples do that which is not lawful to do upon the sabbath day. 3 But he said unto them, Have ye not read what David did, when he was an hungred, and they that were with him; 4 How he entered into the house of God, and did eat the shewbread, which was not lawful for him to eat, neither for them which were with him, but only for the priests? 5 Or have ye not read in the law, how that on the sabbath days the priests in the temple profane the sabbath, and are blameless? 6 But I say unto you, That in this place is one greater than the temple. 7 But if ye had known what this meaneth, ["] I will have [desire] mercy, and not sacrifice ["] [(quote from Hos 6:6. see below)], ye would not have condemned the guiltless. 8 For the Son of man is Lord even of the sabbath day. (KJV) Hosea 6:6 6 For I desired mercy, and not sacrifice; and the knowledge of God more than burnt offerings. (KJV) After the Gospels (which were prior to Christ's fulfilling), the only mention of Sabbath is regarding the Jews that they (Disciples) were trying to convert to Christianity. The Apostles did not teach that observing the day of rest (the Sabbath) was necessary to salvation, quite the contrary: Col 2:8-17 8 Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ. 9 For in him dwelleth all the fulness of the Godhead bodily. 10 And ye are complete in him, which is the head of all principality and power: 11 In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ: 12 Buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead. 13 And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses; 14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross; 15 And having spoiled principalities and powers, he made a shew of them openly, triumphing over them in it. 16 Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: 17 Which are a shadow of things to come; but the body is of Christ. (KJV) Acts 15:5-31 5 But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses. 6 And the apostles and elders came together for to consider of this matter. 7 And when there had been much disputing, Peter rose up, and said unto them, Men and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe. 8 And God, which knoweth the hearts, bare them witness, giving them the Holy Ghost, even as he did unto us; 9 And put no difference between us and them, purifying their hearts by faith. 10 Now therefore why tempt ye God, to put a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear? 11 But we believe that through the grace of the Lord Jesus Christ we shall be saved, even as they. 12 Then all the multitude kept silence, and gave audience to Barnabas and Paul, declaring what miracles and wonders God had wrought among the Gentiles by them. 13 And after they had held their peace, James answered, saying, Men and brethren, hearken unto me: 14 Simeon hath declared how God at the first did visit the Gentiles, to take out of them a people for his name. 15 And to this agree the words of the prophets; as it is written, 16 After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build again the ruins thereof, and I will set it up: 17 That the residue of men might seek after the Lord, and all the Gentiles, upon whom my name is called, saith the Lord, who doeth all these things. 18 Known unto God are all his works from the beginning of the world. 19 Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God: 20 But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood. 21 For Moses of old time hath in every city them that preach him, being read in the synagogues every sabbath day. 22 Then pleased it the apostles and elders, with the whole church, to send chosen men of their own company to Antioch with Paul and Barnabas; namely, Judas surnamed Barsabas, and Silas, chief men among the brethren: 23 And they wrote letters by them after this manner; The apostles and elders and brethren send greeting unto the brethren which are of the Gentiles in Antioch and Syria and Cilicia: 24 Forasmuch as we have heard, that certain which went out from us have troubled you with words, subverting your souls, saying, Ye must be circumcised, and keep the law: to whom we gave no such commandment: 25 It seemed good unto us, being assembled with one accord, to send chosen men unto you with our beloved Barnabas and Paul, 26 Men that have hazarded their lives for the name of our Lord Jesus Christ. 27 We have sent therefore Judas and Silas, who shall also tell you the same things by mouth. 28 For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things; 29 That ye abstain from meats offered to idols, and from blood, and from things strangled, and from fornication: from which if ye keep yourselves, ye shall do well. Fare ye well. 30 So when they were dismissed, they came to Antioch: and when they had gathered the multitude together, they delivered the epistle: 31 Which when they had read, they rejoiced for the consolation. (KJV) In addition to Sabbath, and Circumcision which Christ fulfilled (circumcision is now of the heart and includes women - Rom 2:29), Christ became our Passover as well: 1 Cor 5:6-8 6 Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump? 7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: 8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth. (KJV)