I have received commandment to bless - literally, “I have received to bless.” The reason of his blessing lay in the augury which he acknowledged, and in the divine overruling impulse which he could not resist, not in any “commandment” in words.
Related Commentaries of Numbers 23:20
Numbers 23:20
20 Behold, I have received commandment to bless: and he hath blessed; and I cannot reverse it.