Adam Clarke Bible Commentary

We have sworn unto them - Although the Israelites were deceived in this business, and the covenant was made on a certain supposition which was afterwards proved to have had no foundation in truth, and consequently the whole engagement on the part of the deceived was hereby vitiated and rendered null and void; yet, because the elders had eaten with them, offered a covenant sacrifice, and sworn by Jehovah, they did not consider themselves at liberty to break the terms of the agreement, as far as the lives of the Gibeonites were concerned. That their conduct in this respect was highly pleasing to God is evident from this, that Joshua is nowhere reprehended for making this covenant, and sparing the Gibeonites; and that Saul, who four hundred years after this thought himself and the Israelites loosed from this obligation, and in consequence oppressed and destroyed the Gibeonites, was punished for the breach of this treaty, being considered as the violator of a most solemn oath and covenant engagement. See Sa2 21:2-9, and Eze 17:18, Eze 17:19. All these circumstances laid together, prove that the command to destroy the Canaanites was not so absolute as is generally supposed: and should be understood as rather referring to the destruction of the political existence of the Canaanitish nations, than to the destruction of their lives. See the notes on Deu 20:10, Deu 20:17.