Deuteronomy 16:10

10Then you shall celebrate the 16:10 Also called the “Feast of Harvest” (Ex 23:16) or “day of first fruits” (Num 28:26). Later called “Pentecost” (Acts 2:1).Feast of Weeks to the Lord your God with a tribute of a freewill offering from your hand, which you shall give [to Him] just as the Lord your God blesses you;