1 Chronicles 23:31
and whenever burnt offerings were presented to Jehovah on Sabbaths and at New Moon festivals and at appointed feasts. They were to serve before Jehovah regularly in the proper number and in the way prescribed for them.
Isaiah 1:13-14
Do not bring any more worthless grain offerings. Your incense is disgusting to me! So are your New Moon Festivals, your days of worship, and the assemblies you call. I cannot endure your evil assemblies!
Leviticus 23:1-17
Jehovah spoke to Moses:
Leviticus 23:24
Observe a special day of rest on the first day of the seventh month. Gather together for worship when the trumpets sound.
Leviticus 23:39
Celebrate Jehovah's festival for seven days. This should begin on the fifteenth day of the seventh month; at the time you gather what the land produces. The first and the eighth days will be worship festivals.
Numbers 10:10
Joyful occasions such as your New Moon Festivals and your other religious festivals, you are to blow the trumpets when you present your burnt offerings and your fellowship offerings. Then I will help you. I AM JEHOVAH YOUR GOD!
Numbers 28:1-29
Jehovah commanded Moses:
Psalm 81:1-4
([Psalm of Asaph]) Sing for joy to God our strength. Shout joyfully to the God of Jacob.