Sahih Muslim
The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness (Kitab Al-Dhikr)
Book Number: 035 / Hadith Number: 6576
Juwairiya reported that Allah's Messenger (may peace be upon him) happened to pass by her as she was observing her dawn prayer; or after she had observed her dawn prayer. The rest of the hadith is the same but with this variation that he said:" Hallowed be Allah according to the number of His creation, hallowed be Allah according to the pleasure of His Self, hallowed be Allah according to the weight of His Throne, hallowed be Allah according to the ink used in recording His words."