Moses
Numbers 3:12BSB·traditional attribution

“Behold, I have taken the Levites from among the children of Israel in place of every firstborn Israelite from the womb. The Levites belong to Me,

John Calvin Reformed @genevareformer

12. And I, behold, I have taken the Levites A little further on we shall see more clearly why God claims one tribe for Himself; He now only shews that the Levites rightfully belong to Him, because by special privilege the first-born of the people were preserved in the destruction of the Egyptians. God, therefore, declares that those, whose lives were thus gratuitously spared, were purchased to Himself.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. The family of Aaron is confirmed in the priests' office, Num 3:10. They had been called to it before, and consecrated; here they are appointed to wait on their priests' office: the apostle uses this phrase (Rom 12:7), Let us wait on our ministry.

Commenting on Numbers 3:1-13

John Gill Reformed Baptist @doctorgill

And I, behold, I have taken the Levites from among the children of Israel,.... Separated them from others, and set them apart for the service of the sanctuary; this was his own act and deed, and which he did of his own will and pleasure, who is a sovereign Being, and might and would do whatsoever he pleased, nor should any object unto him, or...