Exodus 29:44

Verse 44. I will sanctify - both Aaron and his sons] So we find the sanctification by Moses according to the Divine institution was only symbolical; and that Aaron and his sons must be sanctified, i.e., made holy, by God himself before they could officiate in holy things. From this, as well as from many other things mentioned in the sacred writings, we may safely infer that no designation by man only is sufficient to qualify any person to fill the office of a minister of the sanctuary. The approbation and consecration of man have both their propriety and use, but must never be made substitutes for the unction and inspiration of the Almighty. Let holy men ordain, but let God sanctify; then we may expect that his Church shall be built up on its most holy faith.