(9) Supplications
كتاب الدعوات
(3a) Chapter: The Reward for Glorifying, Praising, Declaring God’s Unity and His Greatness - Section 1
(3) باب ثواب التسبيح والتحميد - الفصل الأول
Mishkat al-Masabih 2300 
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.
وَعَنْ أَبِي ذَرٍّ قَالَ: سُئِلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَيُّ الْكَلَامِ أَفْضَلُ؟ قَالَ: " مَا اصْطَفَى اللَّهُ لِمَلَائِكَتِهِ: سُبْحَانَ اللَّهِ وَبِحَمْدِهِ ". رَوَاهُ مُسلم
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 2300
In-book reference : Book 9, Hadith 74