Anas (May Allah be pleased with him) reported:
The Prophet (ﷺ) said, "Allah says: ' When a slave of Mine draws near to Me a span, I draw near to him a cubit; and if he draws near to Me a cubit, I draw near to him a fathom. And if he comes to Me walking, I go to him running."'.[Al-Bukhari].
Arabic/English book reference: Book 1, Hadith 96