Exodus 29:1-4

“This is what you are to do to consecrate them, so they may serve me as priests: Take a young bull and two rams without defect. And from the finest wheat flour make round loaves without yeast, thick loaves without yeast and with olive oil mixed in, and thin loaves without yeast and brushed with olive oil. Put them in a basket and present them along with the bull and the two rams. Then bring Aaron and his sons to the entrance to the tent of meeting and wash them with water.