Deuteronomy 16:9-12

Count seven weeks from the time you begin to harvest the grain, and then celebrate the Feast of Weeks for the LORD your God. Bring an offering as a special gift to him, giving to him just as he has blessed you. Rejoice before the LORD your God at the place he will choose to be worshiped. Everybody should rejoice: you, your sons and daughters, your male and female servants, the Levites in your town, the strangers, orphans, and widows living among you. Remember that you were slaves in Egypt, and carefully obey all these laws.