'Weeks' in the Bible

"Count off seven weeks from when the sickle is first put to standing grain.

Then observe the Festival of Weeks in the presence of the LORD your God by giving your tribute and the freewill offering of your hands in proportion to the manner in which the LORD your God blessed you.

"Every male must appear in the presence of the LORD your God three times a year at the place where he will choose: for the Festival of Unleavened Bread, the Festival of Seven Weeks, and the Festival of Tents. He must not appear in the LORD's presence empty-handed,