Deuteronomy 16:10,17
And you shall keep the feast of weeks to the LORD your God with a tribute of a freewill offering of your hand, which you shall give to the LORD your God, according as the LORD your God has blessed you:
Torrey's Topical Textbook—AKJV

1 Corinthians 16:2
On the first day of the week let every one of you lay by him in store, as God has prospered him, that there be no gatherings when I come.
Torrey's Topical Textbook—AKJV