Musnad Abu Ya'la al-Mawsili 42:401

Zuhayr narrated to us, al-Hasan ibn Musa narrated to us, Ibn Lahi'ah narrated to us, Darraj Abu al-Samh narrated to us, that Abu al-Haytham narrated to him, from Abu Sa'id, from the Messenger of Allah (may Allah bless him and grant him peace), that a man said: "O Messenger of Allah, glad tidings (tuba) to whoever saw you and believed in you." He said: "Glad tidings to whoever saw me and believed in me, then glad tidings, then glad tidings, then glad tidings to whoever believed in me and did not see me." A man said to him: "And what is 'tuba'?" He said: "A tree in Paradise, the distance of a hundred years; the garments of the people of Paradise come out from its calyxes."