Exodus 30:21
And they shall wash their hands and their feet, that they may not die; and it shall be an everlasting statute for them, for him and for his seed throughout their generations.
Exodus 28:43
And they shall be upon Aaron and his sons when they enter into the tent of meeting, or when they come near to the altar to serve in the sanctuary; that they may not bear iniquity and die an everlasting statute for him and his seed after him.
Exodus 27:21
In the tent of meeting outside the veil, which is before the testimony, Aaron and his sons shall dress them from evening to morning before Jehovah: it is an everlasting statute, for their generations, on the part of the children of Israel.