'Weeks' in the Bible

You shall count for yourselves seven weeks: from the time you begin to put the sickle to the standing grain you shall begin to number seven weeks.

You shall keep the feast of weeks to Yahweh your God with a tribute of a freewill offering of your hand, which you shall give, according as Yahweh your God blesses you:

Three times in a year shall all your males appear before Yahweh your God in the place which he shall choose: in the feast of unleavened bread, and in the feast of weeks, and in the feast of tents; and they shall not appear before Yahweh empty: