Matthew Poole and continuators on Judges 15:18

18 ¶ And he was sore athirst , and called on the LORD, and said, Thou hast given this great deliverance into the hand of thy servant: and now shall I die for thirst, and fall into the hand of the uncircumcised ?

So as he was ready to faint and die with Thirst; which was natural, from his excessive toil and heat; partly, sent by God, that by the experience of his own Impotency, he might be forced to ascribe the Victory to God onely, and not to himself.

Wilt thou not finish what thou hast begun? Wilt thou undo what thou hast done.