´Narrated Hudhaifah [may Allah be pleased with him]:` "We were sitting with the Prophet (ﷺ) and he said: 'I do not know how long I will be with you, so stick to the two after me,' and he signaled towards Abu Bakr and 'Umar."
Hadith Referenceسنن ترمذي / كتاب المناقب عن رسول الله صلى الله عليه وسلم / 3663