'Feast of Weeks' in the Bible

And you shall observe the feast of weeks, of the first fruits of wheat harvest, and the feast of ingathering at the year's end.

Also on the day of the first fruits, when you bring a new grain offering unto the LORD, at your Feast of Weeks, you shall have a holy convocation; you shall do no regular work:

And you shall keep the feast of weeks unto the LORD your God with a tribute of a freewill offering of your hand, which you shall give unto the LORD your God, according as the LORD your God has blessed you:

Three times in a year shall all your males appear before the LORD 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 tabernacles: and they shall not appear before the LORD empty:

Even according to a certain duty every day, offering according to the commandment of Moses, on the sabbaths, and on the new moons, and on the solemn feasts, three times in the year, even in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles.