Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "If there were to be a prophet after me, it would have been Umar bin al-Khattab (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14928