'Feasts of the Lord' in the Bible

So Moses declared to the Israelites the appointed feasts of the Lord.

Observe, I am about to build a house for the Name of the Lord my God, dedicated to Him, to burn fragrant incense [of sweet spices] before Him, to set out the showbread continually, and to offer burnt offerings morning and evening, on Sabbaths, New Moons, and on the festivals of the Lord our God, as ordained forever in Israel.

and afterward, there was the continual burnt offering, the offering at the New Moons, and at all the appointed festivals of the Lord that were consecrated, and the offerings of everyone who made a voluntary offering to the Lord.