Musnad Abu Ya'la al-Mawsili 160:206

And with his chain of narration, he said: The Messenger of Allah, may Allah bless him and grant him peace, said—meaning Allah, the Mighty and Majestic, said: "If My servant draws near to Me by a span, I draw near to him by a cubit. And if he draws near to Me by a cubit, I draw near to him by an arm's length. And if he draws near to Me by an arm's length, I come to him at a jogging pace."