The book of ths dead, Numbers, has one occurrence of the word adôn אדון, lord. It comes after the people plot to return to Egypt, and after Joshua and Caleb plead with the Israelites to quit their fear and unbelief. It comes after Moses’ pitch, ” Won’t the neighbors say you, Yahweh, have failed? This is the same intercession that Moses played after the golden calf episode.
It is in this timeframe that Yahweh declared the forty years of wandering and the death of all except Caleb and Joshua.
And now, I beseech thee, let the power of my Lord be great, according as thou hast spoken, saying, 14:17
Except for the crises in this period I do not know why here is the only place where adonai turns up and does so in a diplomatic phrase: “let my lord’s power be great as you said”.