1 Chronicles 23:31
And to wait on every offering of burnt sacrifices unto the LORD, the Sabbaths and first days of the months, and other feastful days by number and custom, was their office ever before the LORD.
Isaiah 1:13-14
Offer me no more oblations, for it is but lost labour. I abhor your incense. I may not away with your new moons, your Sabbaths and solemn days. Your fastings are also in vain.
Leviticus 23:1-17
And the LORD spake unto Moses, saying,
Leviticus 23:24
"Speak unto the children of Israel, and say, 'The first day of the seventh month shall be a rest of remembrance unto you, to blow horns in a holy feast it shall be,
Leviticus 23:39
"'Moreover in the fifteenth day of the seventh month after that ye have gathered in the fruits of the land, ye shall keep holy day unto the LORD seven days long. The first day shall be a day of rest, and the eighth day shall be a day of rest.
Numbers 10:10
Also, when ye be merry in your feast days and in the first days of your months, ye shall blow the trumpets over your burnt sacrifices and peaceofferings, that it may be a remembrance of you before your God. I am the LORD your God."
Numbers 28:1-29
And the LORD spake unto Moses, saying,
Psalm 81:1-4
{To the Chanter, upon Gittith, of Asaph} Sing merrily unto God, our strength; make a cheerful noise unto the God of Jacob.