Language:
كتاب المناقب
61  
Virtues and Merits of the Prophet (pbuh) and his Companions
(25)
Chapter: The signs of Prophethood in Islam
(25)
باب عَلاَمَاتِ النُّبُوَّةِ فِي الإِسْلاَمِ
Sahih al-Bukhari 3596

Narrated `Uqba bin `Amr:

The Prophet (ﷺ) once came out and offered the funeral prayer for the martyrs of Uhud, and proceeded to the pulpit and said, "I shall be your predecessor and a witness on you, and I am really looking at my sacred Fount now, and no doubt, I have been given the keys of the treasures of the world. By Allah, I am not afraid that you will worship others along with Allah, but I am afraid that you will envy and fight one another for worldly fortunes."

حَدَّثَنِي سَعِيدُ بْنُ شُرَحْبِيلَ، حَدَّثَنَا لَيْثٌ، عَنْ يَزِيدَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ يَوْمًا فَصَلَّى عَلَى أَهْلِ أُحُدٍ صَلاَتَهُ عَلَى الْمَيِّتِ، ثُمَّ انْصَرَفَ إِلَى الْمِنْبَرِ، فَقَالَ ‏ "‏ إِنِّي فَرَطُكُمْ، وَأَنَا شَهِيدٌ عَلَيْكُمْ، إِنِّي وَاللَّهِ لأَنْظُرُ إِلَى حَوْضِي الآنَ، وَإِنِّي قَدْ أُعْطِيتُ خَزَائِنَ مَفَاتِيحِ الأَرْضِ، وَإِنِّي وَاللَّهِ مَا أَخَافُ بَعْدِي أَنْ تُشْرِكُوا، وَلَكِنْ أَخَافُ أَنْ تَنَافَسُوا فِيهَا ‏"‏‏.‏
Reference : Sahih al-Bukhari 3596
In-book reference : Book 61, Hadith 104
USC-MSA web (English) reference : Vol. 4, Book 56, Hadith 795
  (deprecated numbering scheme)