Moses
Leviticus 21:24KJV·traditional attribution
And Moses told it unto Aaron, and to his sons, and unto all the children of Israel.
Matthew Henry Presbyterian
The priesthood being confined to one particular family, and entailed upon all the male issue of that family throughout their generations, it was very likely that some or other in after-ages that were born to the priesthood would have natural blemishes and deformities: the honour of the priesthood would not secure them from any of those calamities which are common to men.
Commenting on Leviticus 21:16-24
Keil & Delitzsch Lutheran
Lev 21:24 Moses communicated these instructions to Aaron and his sons.