Mishkat al-Masabih
Mishkat al-Masabih 2300
Arabic hadith text
وَعَنْ أَبِي ذَرٍّ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَيُّ الْكَلَامِ أَفْضَلُ؟ قَالَ: " مَا اصْطَفَى اللَّهُ لِمَلَائِكَتِهِ: سُبْحَانَ اللَّهِ وَبِحَمْدِهِ ". رَوَاهُ مُسلم
Translation
Abu Dharr reported that the Messenger of God (peace be upon him) was asked, ‘Which words are best?’ He replied, ‘Those God chose for His angels: “Glory be to God and praise be to Him.”’ Muslim transmitted it. The Arabic source grades it sahih (al-Albani).