Narrated `Uqba bin 'Amir:Once the Prophet (ﷺ) went out and offered the funeral prayers for the martyrs of Uhud, and then went to the pulpit and said, "I am a predecessor for you and I am a witness for you: and by Allah, I am looking at my Fount just now, and the keys of the treasures of the earth (or the keys of the earth) have been given to me: and by Allah, I am not afraid that you will worship others besides Allah after me, but I am afraid that you will strive and struggle against each other over these treasures of the world."
حَدَّثَنَا عَمْرُو بْنُ خَالِدٍ، حَدَّثَنَا اللَّيْثُ، عَنْ يَزِيدَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ ـ رضى الله عنه ـ أَنَّ النَّبِيَّ صلى الله عليه وسلم خَرَجَ يَوْمًا فَصَلَّى عَلَى أَهْلِ أُحُدٍ صَلاَتَهُ عَلَى الْمَيِّتِ، ثُمَّ انْصَرَفَ عَلَى الْمِنْبَرِ فَقَالَ " إِنِّي فَرَطٌ لَكُمْ، وَأَنَا شَهِيدٌ عَلَيْكُمْ، وَإِنِّي وَاللَّهِ لأَنْظُرُ إِلَى حَوْضِي الآنَ، وَإِنِّي أُعْطِيتُ مَفَاتِيحَ خَزَائِنِ الأَرْضِ ـ أَوْ مَفَاتِيحَ الأَرْضِ ـ وَإِنِّي وَاللَّهِ مَا أَخَافُ عَلَيْكُمْ أَنْ تُشْرِكُوا بَعْدِي، وَلَكِنْ أَخَافُ عَلَيْكُمْ أَنْ تَنَافَسُوا فِيهَا ".
Bukhari
To make the Heart Tender (Ar-Riqaq) • Hadith 178