I heard the Messenger of Allah ﷺ say, "Among the signs of the Hour are that knowledge will diminish, ignorance will spread, fornication will become widespread, women will become numerous, and men will become few, until there will be one man in charge of fifty women."
سمعت رسول الله ﷺ يقول: من أشراط الساعة أن يقل العلم، ويظهر الجهل، ويظهر الزنا، وتكثر النساء، ويقل الرجال، حتى يكون لخمسين امرأة القيم الواحد.
Bukhari narrated it in "Knowledge" (81), and this is his wording, and Muslim narrated it in "Knowledge" (2671:9), both of them via Shubah, from Qatada, from Anas, who said, "I will surely tell you a hadith that no one will tell you after me," and he mentioned it.