Leviticus 23:40-41

⁴⁰And ye shall take to you in the first day fruits of the fairest tree, and the branches of palm trees, and the branches of a thick-boughed tree, and sallows of the running stream, and ye shall be glad before your Lord God;

⁴¹and ye shall hallow his solemnity seven days in the year; it shall be a lawful thing everlasting in your generations. In the seventh month ye shall hallow the feast days,