John Gill Commentary 2 Kings 3:17

"For thus saith Jehovah, Ye shall not see wind, neither shall ye see rain; yet that valley shall be filled with water, and ye shall drink, both ye and your cattle and your beasts." — 2 Kings 3:17 (ASV)

For thus says the Lord, you shall not see wind, neither shall
you see the rain
Neither perceive the south wind blow, which usually brings rain, nor clouds gathering in the heavens, as portending it, nor any filling from there:

yet that valley shall be filled with water ;
and all the ditches dug in it:

that you may drink, both you and your cattle, and all your beasts ;
there would be such a quantity as would be enough for them all, the soldiers, the horses they rode on, and the beasts that drew their wagons.