18:12 thum-ma ba'Athnaahum li na'Ålama ay-yul Hizbayni aHSaa limaa labithuu amadaa

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Ahmed Raza Khan: Mohammed Aqib Qadri:
We then awakened them to see which of the two groups more accurately tells the period they had stayed.

Yusuf Ali:
Then We roused them, in order to test which of the two parties was best at calculating the term of years they had tarried!

Pickthal:
And afterward We raised them up that We might know which of the two parties would best calculate the time that they had tarried.