Numbers 7:88-89

and all the oxen for the sacrifice of the peace offerings were twenty-four bulls, the rams sixty, the male goats sixty, the male lambs one year old sixty. This was the dedication for the altar [of burnt offering] after it was anointed. Now when Moses went into the Tent of Meeting (tabernacle) to speak with the LORD, he heard the voice speaking to him from above the mercy seat (the gold cover) that was on the ark of the Testimony from between the two cherubim; and He spoke [by special revelation] to him.