I wot not who hath done this thing - The servants of Abimelech had committed these depredations on Abraham without any authority from their master, who appears to have been a very amiable man, possessing the fear of God, and ever regulating the whole of his conduct by the principles of righteousness and strict justice.

And Abimelech said, (l) I wot not who hath done this thing: neither didst thou tell me, neither yet heard I [of it], but to day.
(l) Wicked servants do many evils unknown to their masters.

And Abimelech said, I wot not who hath done this thing,.... He pleads ignorance; he knew nothing of it before, nor now which of his servants had done it; intimating, that if he could know who it was, he should severely reprimand him for it:
neither didst thou tell me: signifying that he was to blame he did not complain of it sooner; and at least he had no reason to blame him, since he had never informed him before of it, and therefore could not expect to be redressed:
neither yet heard of it but today: he had not heard of it from others, as the Targum of Jonathan rightly adds, by way of explanation, but that very day, and very probably not till the moment he had it from Abraham himself.