Kohanim is the Hebrew word for priest. The book of Leviticus, which describes the priesthood duties, is Vayikra, and means “and He called.” They were called to minister. They were chosen to bring sacrifices to God.
In the 5 books of Moses: Genesis, Exodus, Leviticus, Numbers and Deuteronomy, the book of Leviticus is the center of the Torah. Torah means ‘to shoot out the hand as pointing, to show,’ to indicate the way to God, knowledge or revelation.
The two books before Leviticus are Genesis and Exodus, and if you take every 50th letter of these two books, which are written from right to left, you’ll end up with a repetition of the word TORAH. The same happens in the two books that follow Leviticus. The word Torah is in all the books, written from right to left.
In the Bible, the number 50 represents a full circle, fullness, joy, the perfection of the Spirit of God.
To know God, there must be a sacrifice. Therefore, the Torah points to the priests (Levites), the chosen ones, because the priests were the only ones who brought sacrifices to God so the people would know Him.
We were made a nation of priests (those who truly know God through the High Priest Jesus), to bring the knowledge of God to mankind, which in Hebrew is the word Torah that points to the center. For this reason, the only way for anyone to know God is to sacrifice, and without a priest there is no sacrifice. Melchizedek blessed Abram. There, God was revealed to Abram, and he gave the firstfruits to the High Priest.