Albert Barnes' Notes on the Whole Bible - Deuteronomy 16:9-12
Feast of Weeks; and Deuteronomy 16:13-17, Feast of Tabernacles. Nothing is here added to the rules given in Leviticus and Numbers except the clauses so often recurring in Deuteronomy and so characteristic of it, which restrict the public celebration of the festivals to the sanctuary, and enjoin that the enjoyments of them should be extended to the Levites, widows, orphans, etc. read more
The Pulpit Commentary - Deuteronomy 16:11
Rejoice before the Lord. "The expression, to rejoice before the Lord , denotes here nothing else than to honor him by sacred songs; comp. Spencer, 'De Legg. Hebrews Ritual.,' p. 881, edit. 3". In the place which the Lord thy God hath chosen to place his name there ; rather, shall choose , as in verse 15. read more