John Calvin Commentary Genesis 26:29

"that thou wilt do us no hurt, as we have not touched thee, and as we have done unto thee nothing but good, and have sent thee away in peace. Thou art now the blessed of Jehovah." — Genesis 26:29 (ASV)

As we have not touched thee. An accusing conscience urges them to desire to hold him closely bound to them; and therefore they require an oath from him that he will not harm them. For they knew that he might rightfully avenge himself on them for the sufferings he had endured, but they dissemble on this point and even make a remarkable boast of their own acts of kindness.

At first, indeed, the king's humanity was remarkable, for he not only entertained Isaac with hospitality but also treated him with special honor; yet he by no means continued to act this way to the end. It is in keeping, however, with the common custom of people to disguise their own faults by whatever artifice or pretext they can invent.

But if we have committed any offense, it is more fitting for us to confess our fault honestly than, by denying it, to wound even more deeply the minds of those we have injured. Nevertheless, Isaac, since he had already sufficiently pierced their consciences, does not press them any further. For strangers are not to be treated by us as members of our household; but if they do not benefit from our efforts, they are to be left to the judgment of God.

Therefore, although Isaac does not force a rightful confession from them; yet, so that he might not be thought to harbor any inward hostility towards them, he does not refuse to make a covenant with them. Thus we learn from his example that if any have become estranged from us, they are not to be rejected when they again offer themselves to us.

For if we are commanded to pursue peace, even when it seems to flee from us, we should be far less inclined to be rejecting when our enemies voluntarily seek reconciliation; especially if there is any hope of future improvement, although true repentance may not yet appear. And he receives them to a feast, not only for the sake of promoting peace but also to show that he, having put aside all offense, has become their friend.

Thou art now the blessed of the Lord. This is commonly explained to mean that they seek his favor with flattery, just as people are accustomed to flatter when they ask for a favor; but I am more inclined to think this expression was added in a different sense. Isaac had complained of their injuries in having expelled him through envy: they answer that there was no reason why any trace of grief should remain in his mind, since the Lord had treated him so kindly and so exactly according to his own desire; as if they had said, "What do you want? Are you not content with your present success? Let us grant that we have not discharged the duty of hospitality towards you; yet the blessing of God abundantly suffices to erase the memory of that time." Perhaps, however, by these words, they again assert that they are acting towards him with good faith because he is under the guardianship of God.