The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness (Kitab Al-Dhikr)
Muslim :: Book 35 : Hadith 6472
This hadith has been narrated on the authority of A'mash with the same chain of transmitters, but there is no mention of these words:" He draws near Me by the space of a hand, I draw near him by the space (covered) by two hands."