Narrated `Abdullah:
Allah's Messenger (ﷺ) said, "The key of the Unseen are five: Verily with Allah (Alone) is the knowledge of the Hour He sends down the rain and knows what is in the wombs. No soul knows what it will earn tomorrow, and no soul knows in what land it will die. Verily, Allah is All-Knower, All-Aware." (31.34)
USC-MSA web (English) reference: Vol. 6, Book 60, Hadith 151
Arabic reference: Book 65, Hadith 4627