2 Kings 4:23
And he said, Why are you going to him today? it is not a new moon or a Sabbath. But she said, It is well.
Numbers 10:10
And on days of joy and on your regular feasts and on the first day of every month, let the horns be sounded over your burned offerings and your peace-offerings; and they will put the Lord in mind of you: I am the Lord your God.
Numbers 28:11
And on the first day of every month you are to give a burned offering to the Lord; two oxen, one male sheep, and seven he-lambs of the first year, without any mark;
1 Chronicles 23:31
At every offering of burned offerings to the Lord, on Sabbaths, and at the new moons, and on the regular feasts, in the number ordered by the law, at all times before the Lord;
Isaiah 1:13-15
Give me no more false offerings; the smoke of burning flesh is disgusting to me, so are your new moons and Sabbaths and your holy meetings.