מדרש על בראשית 24:51

Laban and Bethuel answered: Since (this) word has come forth from the mouth of the Almighty, we cannot prevent it, as it is said, "Then Laban and Bethuel answered and said, The thing proceedeth from the Lord: we cannot speak unto thee bad or good" (Gen. 24:50). "Behold, Rebecca is before thee; take her and go" (Gen. 24:51).