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In Leviticus 23:9-12 we read the following fore-runner to the resurrection of Jesus in the following parable by God to Moses, to be conveyed to the Israelites:
[Vs 9] "The Lord said to Moses. [Vs 10] 'Speak to the Israelites and say to them: 'When you enter the land I am going to give you and you reap its harvest, bring to the priest a sheaf of the first grain you harvest. [Vs 11] He is to wave the sheaf before the Lord so it will be accepted on your behalf; the priest is to wave it on the day after the Sabbath. [Vs 12] On the day you wave the sheaf, you must sacrifice as a burnt offering to the Lord a lamb a year old without defect.'"
The Feast of Firstfruits [vs 10]. This festival represents the resurrection - first of Jesus Christ, then those who are His when He comes [1 Cor.15:23, 52-54 and 1 Thes.4:13-18]. The feast was observed in the same week as the Feast of Unleavened Bread, the Passover feast which represents the crucifixion of Christ, held on the sixteenth day of the first month, Nisan, the beginning of the barley harvest.
Reference is made by Paul in Acts 20:7 as to the beginning of the Gentile churches coming together to worship the Lord on the first day of the week, on Sunday, the day after the Sabbath:
On the first day of the week when we were gathered together to break bread, Paul began talking to them, intending to leave the next day, and he prolonged his message until midnight."
In 1 Cor.16:2, Paul again infers as to the church worshipping the Lord on the first day of the week, on Sunday, the day after the Sabbath:
"On the first day of every week, each one of you should set aside a sum of money in keeping with his income, saving it up, so that when I come no collections will have to be made."
It is a clear sign, the reason for the Church establishing the worship of the Lord Jesus on the first day of the week was in reverent remembrance of His resurrection which took place of the first day of the week, as recorded in Jn.20:1.