Musnad Ahmad 32:106

Ibn Abi ‘Adi narrated to us, from Humayd, from Anas, who said: The Messenger of Allah (ﷺ) said: "I entered Paradise, and suddenly I was at a palace of gold. I said: 'To whom does this palace belong?' They said: 'To a young man from Quraysh.' I said: 'To whom?' They said: 'To ‘Umar ibn al-Khattab.'" He said: "And were it not for what I know of your protective jealousy, I would have entered it." ‘Umar said: "Would I have protective jealousy against you, O Messenger of Allah?"