Sahih Muslim , Book 48, Hadith 26 (In-Book) ⓘ
Abu Huraira reported Allah's Apostle as saying that Allah, the Exalted and Glorious, said: When My servant draws close to Me by the span of a palm, I draw close to him by the cubit and when he draws close to Me by the cubit, I draw close to him by the space (covered) by two armspans, and when he comes to me walking, I go in a hurry towards him.
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارِ بْنِ عُثْمَانَ الْعَبْدِيُّ، حَدَّثَنَا يَحْيَى، - يَعْنِي ابْنَ سَعِيدٍ - وَابْنُ أَبِي عَدِيٍّ عَنْ سُلَيْمَانَ، - وَهُوَ التَّيْمِيُّ - عَنْ أَنَسِ بْنِ مَالِكٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " قَالَ اللَّهُ عَزَّ وَجَلَّ إِذَا تَقَرَّبَ عَبْدِي مِنِّي شِبْرًا تَقَرَّبْتُ مِنْهُ ذِرَاعًا وَإِذَا تَقَرَّبَ مِنِّي ذِرَاعًا تَقَرَّبْتُ مِنْهُ بَاعًا - أَوْ بُوعًا - وَإِذَا أَتَانِي يَمْشِي أَتَيْتُهُ هَرْوَلَةً " .
also referenced under: Hadith 2675 (Reference) & Book 35, Hadith 6496 (USC-MSA)