We subjugated the chiefs (of tribes) to struggle day and night with him,
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (lo! we subdued) we made subservient (the hills to hymn) with him (the praises (of their lord) with him at nightfall and sunrise) in the morning and evening,
Jalāl al-Dīn al-Maḥallī
تفسير : truly we disposed the mountains to glorify [god] with him, with the same glorification, at evening, at the time of the night prayer, and at sunrise, at the time of the morning prayer, which is when the sun has fully risen with its light extending everywhere.
