كتاب البر والصلة والآداب
45
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
(12)
Chapter: The Virtue Of Love For The Sake Of Allah, May He Be Exalted
(12)
باب فِي فَضْلِ الْحُبِّ فِي اللَّهِ ‏‏
Sahih Muslim 2566

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

Verily. Allah would say on the Day of Resurrection: Where are those who have mutual love for My Glory's sake? Today I shall shelter them in My shadow when there is no other shadow but the shadow of Mine.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكِ بْنِ أَنَسٍ، فِيمَا قُرِئَ عَلَيْهِ عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ، الرَّحْمَنِ بْنِ مَعْمَرٍ عَنْ أَبِي الْحُبَابِ، سَعِيدِ بْنِ يَسَارٍ عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ إِنَّ اللَّهَ يَقُولُ يَوْمَ الْقِيَامَةِ أَيْنَ الْمُتَحَابُّونَ بِجَلاَلِي الْيَوْمَ أُظِلُّهُمْ فِي ظِلِّي يَوْمَ لاَ ظِلَّ إِلاَّ ظِلِّي ‏"‏ ‏.‏
Reference : Sahih Muslim 2566
In-book reference : Book 45, Hadith 46
USC-MSA web (English) reference : Book 32, Hadith 6225
  (deprecated numbering scheme)