´It was narrated that 'Umar bin Khattab said:` "The last thing to be revealed was the Verse on usury but the Messenger of Allah (ﷺ) died before he had explained it to us. So give up usury (interest) and doubtful things."
Hadith ReferenceSunan Ibn Majah / The Chapters on Business Transactions / Hadith: 2276
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:ضعيف, إسناده ضعيف, قتادة عنعن, وله طريق آخر عند الإسماعيلي كما في مسند الفاروق (571/2), وإسناده ضعيف, انوار الصحيفه، صفحه نمبر 460