It is narrated from a companion of Banu Sulaym (may Allah be pleased with him) that he once brought some silver to the Prophet Muhammad (peace and blessings be upon him) and said, "This has been extracted from our mine." The Prophet Muhammad (peace and blessings be upon him) said, "Soon, many mines will appear where the worst of people will be found."
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23645
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف لإبهام الرجل من بني سليم وجده