John Gill Commentary Numbers 21:17

"Then sang Israel this song: Spring up, O well; sing ye unto it:" — Numbers 21:17 (ASV)

Then Israel sang this song ;

Being affected with the free favour and good will of God towards them:

spring up, O well ;

for the springing up of which they prayed in faith, believing in the promise of God, that it would spring up; and so encouraged one another not only to believe it, but even to sing on account of it before it actually did:

sing you unto it ;

or on account of it praise the Lord for it; or "answer to it" ^F13 , it being their manner to sing their songs by responses, or alternately.

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FOOTNOTES:

• F13: (hl wne) "respondete ei", Montanus; "alternis canite ei", Tigurine version, Piscator.