Exodus 29:22-24
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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), 23and one loaf 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; 24and 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.