Sayyiduna Abu al-Darda' (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "After me, follow Abu Bakr and Umar, for these two are the extended rope of Allah. Whoever holds fast to these two has held fast to the firm handhold that will never break."
Tabarani recorded it, and its chain contains narrators whom I do not know.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 14356