Mus'ab bin Sa'd (may Allah have mercy on him) narrates from Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) that he said: Umar (may Allah be pleased with him) is certainly among the people of Paradise, for whatever the Messenger of Allah (peace and blessings be upon him) saw, whether awake or asleep, was true; and he (peace and blessings be upon him) said: "While I was in Paradise, I suddenly saw a house in it, so I asked: Whose is this? And I was told: It belongs to Umar bin al-Khattab."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17444