Here, in Numbers 3, God the Holy Ghost gives us a picture of GOD'S SOVEREIGN GRACE in the Lord's choice of the tribe of Levi to be his priesthood. We know that because God the Spirit tells us precisely that in 1st Peter 2-1-10-

-Again the next day after John stood, and two of his disciples--And looking upon Jesus as he walked, he saith, Behold the Lamb of God---And the two disciples heard him speak, and they followed Jesus.--John 1-35-37

Act 4-20 For we cannot but speak the things which we have seen and heard.

Jdg 16-20 And she said, The Philistines be upon thee, Samson. And he awoke out of his sleep, and said, I will go out as at other times before, and shake myself. And he wist not that the LORD was departed from him.-Jdg 16-21 But the Philistines took him, and put out his eyes, and brought him down to Gaza, and bound him with fetters of brass- and he did grind in the prison house.-Jdg 16-22 Howbeit the hair of his head began to grow again after he was shaven.