Genesis 24:3

That thou shalt not take a wife, &c.— Abraham apprehending probably his own death, and being anxious about his son Isaac, resolved to intrust the great charge of his matrimonial alliance to this faithful and long-approved servant, whom we are not to consider in a low light, but as the first and principal person under so great a man as Abraham. And certified of Isaac's consequence, as being the appointed father of the promised Seed, he was solicitous that he should not enter into any union with the devoted race of Canaan, but with some proper person of his own kindred and family.