Tafseer Ibn Kathir of FUSHSHILAT [38]

فَإِنِ اسْتَكْبَرُوا فَالَّذِينَ عِندَ رَبِّكَ يُسَبِّحُونَ لَهُ بِاللَّيْلِ وَالنَّهَارِ وَهُمْ لَا يَسْأَمُونَ

But if they are arrogant - then those who are near your Lord exalt Him by night and by day, and they do not become weary.