Sahih Bukhari Volume 9, Book 97, Hadith 7407

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، سَمِعْتُ أَبَا صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ يَقُولُ اللَّهُ تَعَالَى أَنَا عِنْدَ ظَنِّ عَبْدِي بِي، وَأَنَا مَعَهُ إِذَا ذَكَرَنِي، فَإِنْ ذَكَرَنِي فِي نَفْسِهِ ذَكَرْتُهُ فِي نَفْسِي، وَإِنْ ذَكَرَنِي فِي مَلأٍ ذَكَرْتُهُ فِي مَلأٍ خَيْرٍ مِنْهُمْ، وَإِنْ تَقَرَّبَ إِلَىَّ بِشِبْرٍ تَقَرَّبْتُ إِلَيْهِ ذِرَاعًا، وَإِنْ تَقَرَّبَ إِلَىَّ ذِرَاعًا تَقَرَّبْتُ إِلَيْهِ بَاعًا، وَإِنْ أَتَانِي يَمْشِي أَتَيْتُهُ هَرْوَلَةً ‏"‏‏.‏

Narrated By Abu Huraira : The Prophet said, "Allah says: 'I am just as My slave thinks I am, (i.e. I am able to do for him what he thinks I can do for him) and I am with him if He remembers Me. If he remembers Me in himself, I too, remember him in Myself; and if he remembers Me in a group of people, I remember him in a group that is better than they; and if he comes one span nearer to Me, I go one cubit nearer to him; and if he comes one cubit nearer to Me, I go a distance of two outstretched arms nearer to him; and if he comes to Me walking, I go to him running.'"