The question is asked , since Paul told the believers to put aside money for their offerings on the first day of the week, does not this instruction imply a change in the Sabbath from the seventh day (Saturday) to the first day (Sunday)? The key to unlock the meaning of the scripture in 1st Corinthians 16 : 1-3  is  to notice that the ” collection for the saints” in verse 1 does not refer to  offerings (plural), given every week in a religious gathering. The “collection” under consideration was a “particular” offering. Romans 15 : 26 calls it a “certain” contribution. Acts 11 : 28 reveals that there was a great famine happening and verse 29 shows that each determined to send relief to the brethren. If anyone looks carefully at 1st Corinthians 16 : 1, it is easy to see that the saints being depicted were those poor saints that were suffering from a famine. Everyone was to lay something aside each week “in storage” until Paul came to receive their gift and take it to Jerusalem. As for why Paul said to set it aside on the “first day of the week” , all we have to see in order to understand this is to notice verse 2 where it says ” as he may prosper “. For anyone to figure just how much to set aside, it was not possible to know how God had prospered them from the week before until they went back to work on the first day of the following week and settled their accounts. Because they kept the Sabbath (seventh day) holy ,they began preparing for the Sabbath by putting away all of their secular business matters on the day before the Sabbath. Because 1st Corinthians 16 : 1 – 3,  is used in an attempt to remove the sanctity of God’s holy Sabbath day, this shows just how very weak the case against God’s holy appointment truly is.