Concise Quran Commentary
I subjugated the mountains with David. They would exalt with his exalting at the end of the day and its beginning at sunrise.
إِنَّا سَخَّرْنَا ٱلْجِبَالَ مَعَهُۥ يُسَبِّحْنَ بِٱلْعَشِىِّ وَٱلْإِشْرَاقِ
We subjected the mountains to join him in glorifying Allah in the evening and the morning,