سورة Al-Qalam 68:28

قَالَ أَوْسَطُهُمْ أَلَمْ أَقُل لَّكُمْ لَوْلَا تُسَبِّحُونَ ٢٨

The most sensible of them said, “Did I not urge you to say, ‘Allah willing.’?”