Abu Dharr reported: The Messenger of Allah, peace and blessings be upon him, was asked, “Which statement is best?” The Prophet said, “It is what Allah has chosen for His angels and His servants: Glory be to Allah and with His praise.”
Source: Ṣaḥīḥ Muslim 2731
Grade: Sahih (authentic) according to Muslim
عَنْ أَبِي ذَرٍّ أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سُئِلَ أَيُّ الْكَلَامِ أَفْضَلُ قَالَ مَا اصْطَفَى اللهُ لِمَلَائِكَتِهِ أَوْ لِعِبَادِهِ سُبْحَانَ اللهِ وَبِحَمْدِهِ
2731 صحيح مسلم كتاب الذكر والدعاء والتوبة والاستغفار باب فضل سبحان الله وبحمده
