Musnad Ahmad 3635

It was narrated that 'Abdullah bin Salimah said: 'Abdullah (رضي الله عنه) said: 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]