Hello FaithfulRev 1:10 is not talking about a particular day of the week.Hope this helpsRevelation 1:10 "I was in the Spirit on the Lord's day, and heard behind me a great voice, as of a trumpet,"This verse is the key to understanding the book of Revelation. Without a clear and full understanding of it, the entire book just will not make sense. The sequence of order will seem strange. "I"; this is John speaking and telling us where he was. "I was in the Spirit", not in his flesh body; "on the Lord's day, and heard behind me a great voice, as of a trumpet". John is taken forward in time, "in the Spirit", to the day of the Lord. The "Day of the Lord" is not referring to Sunday or Saturday. This is the same "Day of the Lord" Paul speaks about in I Thessalonians 5:2, as "coming as a thief in the night". Later in II Thessalonians 2:2-3 Paul makes it clear that at the "Day of the Lord" Christ's return will not happen until "after there will be a great falling away first; and "that man of sin be revealed, the son of perdition". Satan must be revealed in his role as the Antichrist first, before that seventh trumpet can sound, the last trumpet.The time, or day, John was taken to was beyond our time frame, however we are living in the generation that will see it come to pass, and live through what John saw and lived, while in the Spirit. There is only one day that is called "The Day of the Lord" in all the Scriptures.Isaiah 2:12 "For the day of the Lord of hosts shall be upon every one that is proud and lofty, and upon every one that is lifted up; and he shall be brought low."This is the day that our Lord returns. This is the day "God's cup of wrath" is poured out upon His enemies. So John was taken in the Spirit to the last day of this earth age, before the start of the age of the Millennium. If you are still in your flesh body, that day hasn't happened yet, and it is still future to us.Every verse that you read in Revelation from this verse to the end of chapter twenty two, will be viewed from the Lord's day, either looking backwards or forwards a short period of time. If you don't come to that point of time in your understanding with John, the rest of what he is saying just will not make senseNow as far as Luke 6:5 go back a couple of verses and observe how much weight Christ gives to this day,also notice how the Pharisees are doing exactly what people of today are doing.Luke 6:1 "And it came to pass on the second sabbath after the first, that He went through the corn fields; and His disciples plucked the ears of corn, and did eat, bubbing them in their hands."What is this sabbath, and why is this important to note that the second sabbath followed after the first? Sabbath means "rest", So what is our rest suppose to be today? We read in Colossians 2 whereby the sabbaths were nailed to the cross at the time of Christ's death. Jesus Christ became our sabbath or rest. If you claim any other rest other than Christ, you are not in Christ. So this is what this verse is all about. Many times a holy sabbath, or feast day would fall in the middle of the week, so the second sabbath for that week is known to be on the Saturday of our week, and could not be confused with one of the feast day sabbaths that might fall in the middle of the week. Remember that Passover comes 14 days after the spring equinox, no matter what day it would fall on. That makes Passover or a holy feast day a first sabbath when it falls say on a Tuesday or Wednesday. God doesn't change as man does, and you can count on His plan every year.Luke 6:2 "And certain of the Pharisees said unto them, "Why do ye that which is not lawful to do on the sabbath days?"Luke 6:3 "And Jesus answering them said, "Have ye not read so much as this, what David did, when himself was an hungred, and they which were with him;"So Jesus asked these Pharisees if they had not read what was stated in the true Law as it was in David's day. This is similar to what many Christians would say today. We are of the New Testament, we are not suppose to read the Old Testament. That is not what Jesus taught, for that is where all of his teaching came from; the Old Testament. We are suppose to understand all the Old Testament, for Christ quoted it constantly, as did Peter and Paul. If you have, then you will understand a little better what Jesus is about to say here.Luke 6:4 "How he went into the house of God, and did take and eat the shewbread, and gave also to them that were with him; which it is not lawful to eat but for the priest alone?"No, David went beyond what Jesus and His disciples were doing here, for they went in the tabernacle and ate the shew bread right of the altar off God. David and his men took the bread that was set aside for the Levitical priests alone and their families, and ate it.Luke 6:5 "And he said unto them, That the Son of man is Lord also of the sabbath."The Son of man is the Lord of the sabbath, of all rest. Your rest is your peace of mind, that part of your mind that sets order to what you do and think. Those thing that you can not change or affect, you leave to the Father to take care of. Our peace of mind is in the Lord Jesus Christ, and His Word: for He allows us to know what tomorrow will bring, and what the results of our actions will be while we are living in this world of flesh man. Those things that are negative in our lives, the Word leads us around it, through it, or gives us the ability of ordering it out of our lives. When we are in Christ, that is the only rest that we can count on.So what happened to David on that day Jesus is talking about. David and his men was on the run from King Saul, who was trying to kill David. They had been on the run for several day, and David and his men did not have time to stop and eat. They came to the tabernacle, and went to the altar, and took of the bread that was set aside as "shew bread". David also took a sword from the altar also for his defense. This sword that he took was Goliath's sword that David used years before to cut off his head. David was truly a man after God's own heart. David was in the genealogy that Christ would come from, and also from the priest line, so the sabbath was a work day for the priest.Faithful you've got to understand that Christ became our sabbath and we should rest in Him everyday not just Saturday or Sunday.