Inquire of the Lord

Joshua 9:1-15
All of the people alone the entire cost of the Great Sea are heard what Joshua had done to Jericho and Ai. Gibeon restored to a ruse(謀略) made a treaty with Israelite.
The men of Israel sampled their provisions but did not inquire of the Lord. Then Joshua made a treaty of peace with them to let them live, and the leaders of the assembly ratified(ratified ) it by oath.
Gibeon was an important city about 8km north of Jerusalem. The Israelite had been forewarned against an alliance with local people. But the Gebenites employ such cunning (even to the pretence that news of the recent victories at Jericho and Ai has not reached them), that they not only get their treaty but include three other cities too.
Why?
Enemy may do any ruse to against us, so we need to ask the Lord, for the Lord knows everything. It is the smart way to be a Christian.
Sometimes provisions may obscure our heart and mind.
How?
Be aware the trick of Satan and evil men, always inquire of the Lord.