Sunan Ibn Majah
It was narrated from Abu Sa’eed Al-Khudri that the Prophet (ﷺ) said: “I have a Cistern, (as large as the distance) between the Ka’bah and Baitul-Maqdis (Jerusalem). (It is) whiter than milk, and its vessels are the number of the stars. I will be the Prophet (ﷺ) with the most followers on the Day of Resurrection.”
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، حَدَّثَنَا زَكَرِيَّا، حَدَّثَنَا عَطِيَّةُ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَالَ " إِنَّ لِي حَوْضًا مَا بَيْنَ الْكَعْبَةِ وَبَيْتِ الْمَقْدِسِ أَبْيَضَ مِثْلَ اللَّبَنِ آنِيَتُهُ عَدَدُ النُّجُومِ وَإِنِّي لأَكْثَرُ الأَنْبِيَاءِ تَبَعًا يَوْمَ الْقِيَامَةِ " .
Grade: Sahih (Darussalam)
Reference