They did work wilily - Finesse of this kind is allowed by the conduct of all nations; and stratagems in war are all considered as legal. Nine tenths of the victories gained are attributable to stratagem; all sides practice them, and therefore none can condemn them. Much time and labor have been lost in the inquiry, "Did not the Gibeonites tell lies?" Certainly they did, and what is that to us? Does the word of God commend them for it? It does not. Are they held up to us as examples! Surely no. They did what any other nation would have done in their circumstances, and we have nothing to do with their example. Had they come to the Israelites, and simply submitted themselves without opposition and without fraud, they had certainly fared much better. Lying and hypocrisy always defeat their own purpose, and at best can succeed only for a short season. Truth and honesty never wear out.
Old sacks - and wine bottles, old, etc. - They pretended to have come from a very distant country, and that their sacks and the goat-skins that served them for carrying their wine and water in, were worn out by the length of the journey.
They did work wilily - literally, “they also,” or “they too, did work, etc.” The “also” serves, apparently, to connect the stratagem of the Gibeonites with that employed by the Israelites before Ai. It hints that the Gibeonites resolved to meet craft with craft.
Rent and bound up - i. e. the wine skins were torn and roughly repaired by tying up the edges of the tear. The more thorough and careful way, hardly feasible in a hasty journey, would have been to insert a patch.