Sahih Muslim Book 35, Hadith Number 6587.
Chapter : The merit of Subhan Allah Wa Bi Hamdihi.
Abu Dharr reported that Allah’s Messenger (may peace be upon him) said: Should I not inform you about the words liked most by Allah? I said: Allah’s Messenger, do inform me about the words liked most by Allah. He said: Verily, the words liked most by Allah are: “hallowed be Allah and praise is due to Him.”