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, glad tidings - seven times - to the one who believed in me and did not see me."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7979