1:16-18. The response of the two and one-half Transjordanian tribes was enthusiastic and wholehearted. It must certainly have reflected the attitude of all the tribes at this crucial time of preparation for the invasion. What an encouragement this was to the new leader to be sure that the people were united in supporting him. Their pledge of loyalty and obedience (we will go. . . . we will obey you) included the solemn declaration that anyone guilty of disobedience would be executed. The tribes even encouraged Joshua to be strong and courageous! (cf. vv. 6-7, 9)
But there was one condition: they were willing to follow Joshua if he showed clear evidence that he was being led by God (v. 17). This was a wise precaution and one to be carefully followed lest Israel’s leaders turn out to be false prophets or ”blind leaders of the blind.“
cf. confer, compare
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Walvoord, John F. ; Zuck, Roy B. ; Dallas Theological Seminary: The Bible Knowledge Commentary : An Exposition of the Scriptures. Wheaton, IL : Victor Books, 1983-c1985, S. 1:330