“And the men took of their victuals, and asked not counsel at the mouth of the LORD. And Joshua made peace with them, and made a league with them, to let them live: and the princes of the congregation sware unto them.” – Joshua 9:14, 15.
The evidence of coming from a long distance presented by the Gibeonites was hastily accepted by the Jews; they did not even cross check the claims made by the strangers who came to them. They, in their simplicity did not imagine that it was possible for people to hatch such an elaborate scheme just to safeguard themselves. In any case, they had ample opportunity to seek counsel from God but did not do so.
God Almighty had warned them “Take heed to thyself, lest thou make a covenant with the inhabitants of the land whither thou goest, lest it be for a snare in the midst of thee.” (Exodus 34:12) God exhorts us through Solomon the prophet, “Trust in the LORD with all thine heart; and lean not unto thine own understanding. In all thy ways acknowledge him, and he shall direct thy paths.” (Proverbs 3:5, 6) Moreover he stated: “He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.” (Proverbs 28:26) We should seek help and direction from the Lord in whatever we want to do and be patient to know what the will of the Lord is. “A man's heart deviseth his way: but the LORD directeth his steps.” (Proverbs 16:9) St. Paul admonishes “Wherefore be ye not unwise, but understanding what the will of the Lord is.” - Ephesians 5:17