Sahih al-Bukhari 6551

Arabic

حَدَّثَنَا مُعَاذُ بْنُ أَسَدٍ، أَخْبَرَنَا الْفَضْلُ بْنُ مُوسَى، أَخْبَرَنَا الْفُضَيْلُ، عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏مَا بَيْنَ مَنْكِبَىِ الْكَافِرِ مَسِيرَةُ ثَلاَثَةِ أَيَّامٍ لِلرَّاكِبِ الْمُسْرِعِ‏"‏.‏

English translation

Narrated Abu Huraira: The Prophet (ﷺ) said, "The width between the two shoulders of a Kafir (disbeliever) will be equal to the distance covered by a fast rider in three days

Reference: Sahih al-Bukhari 6551, Book of To make the Heart Tender (Ar-Riqaq). English translation by Dr. Muhammad Muhsin Khan.