The God of Abraham, and the God of Nahor, the God of their father, judge betwixt us. And Jacob sware by the fear of his father Isaac. The God of their father - As Laban certainly speaks of the true God here, with what propriety can he say that this God was the God of Terah, the father of Abraham and Nahor? It is certain that Terah was an idolater; of this we have the most positive proof, Joshua 24:2. Because the clause is not in the Septuagint, and is besides wanting in some MSS., Dr. Kennicott considers it an interpolation. But there is no need of having recourse to this expedient if we adopt the reading אביכם abichem, Your father, for אביהם abihem, Their father, which is supported by several of Kennicott's and De Rossi's MSS., and is precisely the same form made use of by Laban, Genesis 31:29, when addressing Jacob, and appears to me to be used here in the same way; for he there most manifestly uses the plural pronoun, when speaking only to Jacob himself.
It is therefore to be considered as a form of speech peculiar to Laban; at least we have two instances of his use of it in this chapter.
Jacob sware by the fear of his father Isaac - See Clarke on Genesis 31:42 (note).