The Prophet (ﷺ) went out and offered the funeral prayer for the martyrs of the (battle of) Uhud and then ascended the pulpit and said, "I am your predecessor and I am a witness against you. By Allah, I am now looking at my Tank-lake (Al-Kauthar) and I have been given the keys of the treasures of the earth (or the keys of the earth). By Allah! I am not afraid that after me you will worship others besides Allah, but I am afraid that you will start competing for (the pleasures of) this world."
Reference: Sahih al-Bukhari 6426 In-book : Book 81, Hadith 15 USC-MSA web (English) : Vol. 8, Book 76, Hadith 434 (deprecated)
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