(Ambiya') 21 : 20
يُسَبِّحُونَ اللَّيْلَ وَالنَّهَارَ لَا يَفْتُرُونَ
They glorify Him in the night and day without any interruption.
It is told in verses 41: 37-38: “Angels near your Lord are Glorifying Him in the night and day, and they are not having any hesitation”. See explanation 2: 152; 3: 101-102 and 7: 205-206.