19 “Then you shall take the other ram, and Aaron and his sons shall lay their hands on the head of the ram. 20“You shall slaughter the ram, and take some of its blood and put it on the lobe of Aaron’s right ear and on the lobes of his sons’ right ears and on the thumbs of their right hands and on the big toes of their right feet, and sprinkle the rest of the blood around on the altar. 21 “Then you shall take some of the blood that is on the altar and some of the anointing oil, and sprinkle it on Aaron and on his garments and on his sons and on his sons’ garments with him; so he and his garments shall be consecrated, as well as his sons and his sons’ garments with him.
22 “You shall also take the fat from the ram and the fat tail, and the fat that covers the entrails and the lobe of the liver, and the two kidneys and the fat that is on them and the right thigh (for it is a ram of ordination), 23 and one cake of bread and one cake of bread mixed with oil and one wafer from the basket of unleavened bread which is set before the LORD; 24 and you shall put all these in the hands of Aaron and in the hands of his sons, and shall wave them as a wave offering before the LORD. 25 “You shall take them from their hands, and offer them up in smoke on the altar on the burnt offering for a soothing aroma before the LORD; it is an offering by fire to the LORD.
It is no secret that blood will stain clothing, yet God asked Moses to sprinkle the blood from one of the rams on their garments. This was a perpetual reminder of their consecration to God. They would never be able to quit being a priest, and they would always need the blood of bulls and rams to purify them from their sin.