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Hisn al-Muslim (Fortress of the Muslim) 256
وَقَالَ صلى الله عليه وسلم: ((كَلِمَتَانِ خَفِيفَتَانِ عَلَى اللِّسَانِ، ثَقِيلَتَانِ فِي الْمِيزَانِ، حَبِيبَتَانِ إِلَى الرَّحْمَنِ: سُبْحَانَ اللَّهِ وَبِحَمْدِهِ، سُبْحانَ اللَّهِ الْعَظِيمِ)).
(Aboo Hurayrah reported that the Messenger of Allah said:’(There are) Two words, (which are ) light on the tongue, heavy on the Scale and beloved to The Most Gracious: (How perfect Allah is and I praise Him. How perfect Allah is, The Supreme.))
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 256).