Exodus 20:24

20:24 ‘You must make for me an altar made of earth, and you will sacrifice on it your burnt offerings and your peace offerings, your sheep and your cattle. In every place where I cause my name to be honored I will come to you and I will bless you.

Exodus 24:4

24:4 and Moses wrote down all the words of the Lord. Early in the morning he built an altar at the foot of the mountain and arranged twelve standing stones – according to the twelve tribes of Israel.

Exodus 38:30

38:30 With it he made the bases for the door of the tent of meeting, the bronze altar, the bronze grating for it, and all the utensils of the altar,

Exodus 40:29

40:29 He also put the altar for the burnt offering by the entrance to the tabernacle, the tent of meeting, and offered on it the burnt offering and the meal offering, just as the Lord had commanded Moses.