Deuteronomy 16:10-12

Then you shall observe the Feast of Weeks for Adonai your God, offering your freewill contribution according as Adonai your God has blessed you. You shall rejoice before Adonai your God with your son and daughter, your male and female slave, the Levite in your communities, and the stranger, the fatherless, and the widow in your midst, at the place where Adonai your God will choose to establish God's name. Bear in mind that you were slaves in Egypt, and take care to obey these laws. [JPS translation edited for gender neutrality]