Leviticus

And there ye shall eat before the Lord your God, and ye shall rejoice in all that ye put your hand unto, ye and your households, wherein the Lord thy God hath blessed thee.

And they found written in the law which the Lord had commanded by Moses, that the children of Israel should dwell in booths in the feast of the seventh month:

Rejoice in the Lord alway: and again I say, Rejoice.

And that they should publish and proclaim in all their cities, and in Jerusalem, saying, Go forth unto the mount, and fetch olive branches, and pine branches, and myrtle branches, and palm branches, and branches of thick trees, to make booths, as it is written.