Hadith 2300
وَعَنْ أَبِي ذَرٍّ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَيُّ الْكَلَامِ أَفْضَلُ؟ قَالَ: مَا اصْطَفَى اللَّهُ لِمَلَائِكَتِهِ: سُبْحَانَ اللَّهِ وَبِحَمْدِهِ . رَوَاهُ مُسلم
Abu Dharr said that God’s messenger was asked what words were most excellent and replied, “What God has chosen for His angles:Glory be to God and I begin with praise of Him.” Muslim transmitted it.