The men took of their provision, and didn't ask counsel at the mouth of Yahweh.
and asked not [counsel] at the mouth of the Lord; as they might and should have done, by desiring the high priest to inquire of the Lord by Urim and Thummim; but this they neglected, which, had they attended to, the fraud would have been discovered; or however, they would have had the mind of God about making peace with the Gibeonites, which in all likelihood he would not have disapproved of, they becoming proselytes, and giving up their possessions to Israel; but this did not excuse their neglect.