Sahih Muslim Book 4, Hadith Number 1248.

Chapter : Excellence of Dhikr after prayer and its description.

Ibn ‘Umar reported: While we said prayer with the Messenger of Allah (may peace be upon him), one among the people said: Allah is truly Great, praise be to Allah in abundance. Glory be to Allah in the morning and the evening. The Messenger of Allah (may peace be upon, him) said: Who uttered such and such a word? A person among the people said: It is I, Messenger of Allah (who have recited these words). He (the Holy Prophet) said: It (its utterance) surprised me, for the doors of heaven were opened for It. Ibn ‘Umar said: I have not abandoned them (these words) since I heard the Messenger of Allah (may peace be upon him) saying this.