16 even unto the morrow after the seventh week shall ye number fifty days; and ye shall present a new meal-offering unto the LORD.
Leviticus 23:16 Cross References - JPS_ASV_Byz
Numbers 28:26
26 Also in the day of the first-fruits, when ye bring a new meal-offering unto the LORD in your feast of weeks, ye shall have a holy convocation: ye shall do no manner of servile work;
Acts 2:1
1 And when the day of Pentecost was now come, they were all with one accord in one place.