Joshua 9:15

And Joshua made peace with them, and made a league with them, to their advantage, to let them live; and the princes of the congregation sware unto them. In the entire transaction Joshua and the heads of Israel acted very foolishly, and the result was a transgression of God's command, who had made the strict rule that no covenants were to be made with the nations of Canaan, Exodus 23:32; Exodus 34:12. The neglect to consult the Word of God in important questions has plunged many a Christian into severe sins.