(19) بَابُ إِذَا قَالَ وَاللَّهِ لاَ أَتَكَلَّمُ الْيَوْمَ. فَصَلَّى أَوْ قَرَأَ أَوْ سَبَّحَ أَوْ كَبَّرَ أَوْ حَمِدَ أَوْ هَلَّلَ، فَهْوَ عَلَى نِيَّتِهِ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "(The following are) two words (sentences or utterances) that are very easy for the tongue to say, and very heavy in the balance (of reward), and most beloved to the Gracious Almighty (And they are): Subhan Allahi wa bi-hamdihi; Subhan Allahi-l-'Adhim,"
Reference: Sahih al-Bukhari 6682
In-book reference: Book 83, Hadith 59
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 673