Midrasch zu Bereschit 26:20

If a man should dare say to a person more important than himself, “Why did you treat me so badly?” he would be held guilty of a serious offense, yet Moses said: For since I came to Pharaoh to speak in Thy name, he hath dealt ill with this people (ibid., v. 23).¹Moses expresses doubt as to God’s ability to save the people from further anguish and is rebuked. The Holy One, blessed be He, said to Moses: Alas for those who have perished but are not to be found! I revealed myself to Abraham, Isaac, and Jacob as the Lord Almighty, but I never disclosed to them that My name is YHWH,²The name employed when speaking of God’s merciful aspect. as I did to you, yet they never criticized My ways. To Abraham I said: Arise, walk through the land in the length thereof (Gen. 13:17), yet though he searched for a burial place for Sarah, and was unable to obtain one until he paid four hundred shekels of silver for it, he did not disparage My ways. I told Isaac: Sojourn in this land …for unto thee, and unto thy seed, I will give all these lands (ibid. 26:3), but even when he sought water to drink and was unable to find any, And the herdsman of Gerar strove with Isaac’s herdsmen, saying: “The water is ours” (ibid., v. 20), he did not criticize My ways. I told Jacob: The land whereon thou liest, to thee will I give it, and to thy seed (ibid. 28:13), yet when he sought a place to pitch his tent, and could not obtain any land until he purchased it with a hundred lambs, he found no fault with My words.

Similarly, (Bereshith 26:20) "And he called the name of the well 'Esek' because they strove ('hitasku') with him." And it is written (Ibid. 33) "And he called it 'shivah,' etc."

And I appeared to Avraham - The Holy One of Blessing said to Moshe: a pity on those who disappear and are not remembered, many times I revealed to Avraham, Yitzchak and Yaakov as E-l Shadai and I did not make Myself known that My name is Yud-Hey-Vav-Hey as I told you, but (also) they did not search for My attributes. I said to Avraham, "rise, walk through the land, its width and breadth" (Gen. 13:17), he wanted to bury Sarah and did not find a place until he bought with money, and he did not search for My attributes. I said to Yitzchak "live in this land, because it will be for you and your seed", he searched for water and did not find it, rather "the shepards of Gerar fought with the shepards of Yitzchak" (Gen. 26:20) and he did not search for My attributes. I told Ya'akov "this land that you lie on etc" (Gen. 28:13), he searched for a place to put up his tent and did not find it until he bought it for 100 coins, and he did not search for My attributes, he did not ask Me My name as you did. You, at the beginning of My sending you, asked what is My name, and at the end you said: "And since I came to Pharaoh" (Ex. 5:23). And regarding this it is written "And I also will maintain My covenant" that was given to them as I said that I will give the land to them, even though they did not search for Me....