This work is an attempt at a comparative analysis of canonical and apocryphal texts about the priestʼs ordination. Based on Chapter 29 in the Book of Exodus and Chapter 7 of the Aramaic Levi Document, we will try to show the common elements accompanying this ceremony and explain their meaning. First, we will try to find the reasons for the election to the priestly ordination of heroes in the given descriptions, and mostly of Aaron and his sons in the Book of Exodus and Levi in A.L.D. We will also try to show the causes of similarity and difference in the rites accompanying the ceremony of priestly ordination. An important part of the work is the description of the history of the individual elements of the ordinance, such as dressing up in priesthood robes, anointing, and the idiomatic expression “filling hands”. Based essentially on the contents of the above passages, we will try to capture their direct relationship with the other texts in the Scriptures, discussed in the Aramaic Levi Document and with some other books of apocryphal literature.