Malachi 2:15

And did not he make one? Yet had he the residue of the spirit, literally, "And not one acted so who still had a particle of reason," that is, this manner of acting was unknown among men of reason. Of course, the people might raise the objection, And wherefore one? What did Abraham do when he repudiated Hagar? But the prophet cuts off the objection short, That he might seek a godly seed. The object of Abraham in going in to Hagar was not to gratify the lust of the flesh, but he honestly thought that he might thus get the son whom God had promised him. Therefore, so the prophet concludes, take heed to your spirit, watching over themselves with the greatest care, and let none deal treacherously against the wife of his youth, namely, by lightly dismissing her.