On the third day they reached Zophim, and when they reached Zophim they saw the glory of the Shekhinah resting upon the top of the mountain, as it is said, "On the third day Abraham lifted up his eyes, and saw the place afar off" (Gen. 22:4). What did he see? (He saw) a pillar of fire standing from the earth to the heavens. Abraham understood that the lad had been accepted for the perfect burnt offering. He said to Ishmael and Eliezer: Do ye see anything upon one of those mountains? || They said to him: No. He considered them (as dull) as an ass. He told them: Since ye do not see anything, "Abide ye here with the ass" (Gen. 22:5), with such who are similar to the ass.
Abraham Sees the Shekhinah Hovering Over Mount Moriah
Pirkei DeRabbi Eliezer 31:6