Sayyiduna Ali (may Allah be pleased with him) said: When the righteous are mentioned, Sayyiduna Umar (may Allah be pleased with him) will be mentioned among them; and we, that is, the Companions of the Prophet (peace and blessings be upon him), did not consider it far-fetched that tranquillity (sakinah) speaks upon the tongue of Sayyiduna Umar (may Allah be pleased with him).
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب المناقب / 14427