It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Glad tidings to the one who saw me and believed in me, and glad tidings to the one who did not see me and believed in me." He (peace and blessings be upon him) repeated this seven times.
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7978