Midrash sur Le Deutéronome 18:13

The Holy One, blessed be He, said: Eliezer ! Thou hast made thyself like a threefold cord, as it is said, "And a threefold cord is not quickly broken" (Eccles. 4:12). I also will apply to thee this verse: "Thou shalt be perfect with the Lord thy God" (Deut. 18:13). Do not read thus, but: "Thou shalt be perfect before the Lord thy God."