Charles Ellicott Commentary Numbers 14:17-18

"And now, I pray thee, let the power of the Lord be great, according as thou hast spoken, saying, Jehovah is slow to anger, and abundant in lovingkindness, forgiving iniquity and transgression; and that will by no means clear [the guilty], visiting the iniquity of the fathers upon the children, upon the third and upon the fourth generation." — Numbers 14:17-18 (ASV)

And now, I implore you, let the power of my Lord be great.— The word Lord in Numbers 14:17 should not be printed in large capitals in this place, as in the Authorised Version of 1611, since it is the rendering of Adonai, not of Jehovah, as in Numbers 14:18. Moses here employs a second argument, founded on the revelation of God’s name (i.e., His nature), as made to him on Mount Sinai (Exodus 34:6–7), the substance of which he here recites in the same terms.