Midras Bilangan 12:3: Midrash Tanchuma, Otzar Midrashim, Devarim Rabbah & Pesikta DeRav Kahana

Both these attributes were possessed by our teacher, Moses. As to humility, it is stated: And the man Moses was very humble (Num. 12:3), and as to fear, it is written: For he feared to look upon God (Exod. 3:6).

13) And also, come and hear the humility of Moshe, for when the Holy Blessed One said to him, "Make the Tent of Meeting," he did so. And when it was done, out of the great humility that was within him he went outside. The Holy Blessed One said to him, "Why did you go outside? Go, it is pleasant that You minister to me!" And from where did the Holy Blessed One call him and say thus to him? As it is said, "And he called to Moshe, and the LORD spoke to him from the Tent of Meeting, saying..." (Leviticus 1:1). And so too the Torah testified that he was humble, as it is said, "And the man Moshe was very humble" (Numbers 12:3). Thus, Moshe merited to be given law by his hand, and for the Presence to dwell over him, for thus said Isaiah, "The spirit of the LORD is upon me, thus the LORD anointed me to herald to the humble" (Isaiah 61:1). What is written is not "to herald to the faithful," but "to herald to the humble." From here we derive that humility is the greatest commandment in the universe. The Holy Blessed One gazed upon all the mountains and found none as befitting to give the Torah on and for the Presence to dwell on like Mt. Sinai, and why did Mt. Sinai merit all this? Because it lowered itself, for when it saw that Mt. Hermon and Mt. Sirion were provoking each other — one saying "He'll dwell on me!" and the other saying "no, He'll dwell on me!" — when Sinai saw that they were provoking each other and increasing themselves, it lowered itself. Therefore the Holy Blessed One saw its lowliness and had His Presence dwell upon it, since God is high and exalted, "seeing the lowly, and loftily perceiving from afar." (Psalms 138:6)

Another matter: “I pleaded with the Lord” – this is what the verse said: “You chastise a man with punishments for iniquity, consuming his delight like a moth. Surely man is mere nothingness” (Psalms 39:12). What is “with punishments for iniquity”? Because of one iniquity that Moses performed, that he chastised Your children and said to them: “Hear now defiant ones” (Numbers 20:10), You afflicted him and rebuked him. “A man” is none other than Moses, as it is stated: “The man Moses was very humble” (Numbers 12:3). What is “consuming his delight like a moth”? All the delight that Moses desired, to enter the Land [of Israel], You caused to be consumed, like a moth that gets into garments and causes them to rot. “His delight” is nothing other than the Land of Israel, like the matter that is stated: “And give you a land of delight…” (Jeremiah 3:19). If that is what befell the righteous Moses, all the more are the rest of the people destined for nothingness and destined for the Day of Judgment. “Surely man is mere nothingness” – Rav Aḥa said: He that became a god [elo’ah], as it is stated: “I have put you as a god [elohim] for Pharaoh” (Exodus 7:1), is now pleading and prostrating himself: “I pleaded with the Lord.”