Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 627
Narrated Anas:
The Prophet said, "My Lord says, 'If My slave comes nearer to me for a span, I go nearer to him for a cubit; and if he comes nearer to Me for a cubit, I go nearer to him for the span of outstretched arms; and if he comes to Me walking, I go to him running.' "