Jami` at-Tirmidhi 3603

Abu Hurairah [may Allah be pleased with him] narrated that the Messenger of Allah (ﷺ) said:“Allah, the Most High said: ‘I am as My slave thinks of Me, and I am with him when he remembers Me. If he remembers Me to himself, I remember him to Myself, and if he remembers Me in a gathering, I remember him in a gathering better than that. And if he seeks to draw nearer to Me by a hand span, I draw nearer to him by a forearm’s length, and if he comes to Me by a forearm’s length, I draw nearer to him by an arm’s length. And if he comes to Me walking, I come to him quickly.’”