Musnad Ahmed: Hadith 4140

Your Prophet (ﷺ) was given the keys of everything except five things: “Verily, Allah, with Him (Alone) is the knowledge of the Hour, He sends down the rain, and knows that which is in the wombs. No person knows what he will earn tomorrow, and no person knows in what land he will die. Verily, Allah is All-Knower, All Aware (of things)" (Luqman 31:34). I said to him: Did you hear that from ‘Abdullah? He said: Yes, more than fifty times.