Leviticus 21:15-18
English Standard Version
Chapter 21
15that he may not profane his offspring among his people, for I am the Lord who sanctifies him."
16And the Lord spoke to Moses, saying,
17"Speak to Aaron, saying, None of your offspring throughout their generations who has a blemish may approach to offer the bread of his God.
18For no one who has a blemish shall draw near, a man blind or lame, or one who has a mutilated face or a limb too long,