Exodus 28:17-21

28:17 You are to set in it a setting for stones, four rows of stones, a row with a ruby, a topaz, and a beryl – the first row; 28:18 and the second row, a turquoise, a sapphire, and an emerald; 28:19 and the third row, a jacinth, an agate, and an amethyst; 28:20 and the fourth row, a chrysolite, an onyx, and a jasper. They are to be enclosed in gold in their filigree settings. 28:21 The stones are to be for the names of the sons of Israel, twelve, according to the number of their names. Each name according to the twelve tribes is to be like the engravings of a seal.

Exodus 29:10-14

29:10 “You are to present the bull at the front of the tent of meeting, and Aaron and his sons are to put their hands on the head of the bull. 29:11 You are to kill the bull before the Lord at the entrance to the tent of meeting 29:12 and take some of the blood of the bull and put it on the horns of the altar with your finger; all the rest of the blood you are to pour out at the base of the altar. 29:13 You are to take all the fat that covers the entrails, and the lobe that is above the liver, and the two kidneys and the fat that is on them, and burn them on the altar. 29:14 But the meat of the bull, its skin, and its dung you are to burn up outside the camp. It is the purification offering.