Deuteronomy 3:26

Your account. Moses cannot help reminding the people that they were the occasion of his giving way to diffidence, and thus incurring a most sensible chastisement from the hands of God. Their conduct had provoked him so, that he gave some outward signs of the trouble with which his mind was so much disturbed, chap. xx. 12. Yet God admits of no excuse, particularly in the sins of those who act in his name, and who, of course, ought to guard against the smallest deviation from virtue. Be ye holy and perfect, is addressed to such in a particular manner. (Haydock)