Musnad Ahmad 1012:101

Abu al-Mughirah narrated to us, Safwan narrated to us, Humayd ibn Abd al-Rahman al-Yazani narrated to me, that a man asked Ubadah ibn al-Samit about the saying of Allah: {For them are glad tidings in the worldly life} [Yunus: 64]. Ubadah said: I asked the Messenger of Allah, peace and blessings of Allah be upon him, and he said: "You have asked me about a matter that no one from my nation has asked me about. That is the righteous vision that the believer sees or is seen for him."