Anas ibn Malik (r.a.) narrates that the Messenger of Allah (s.a.w.) said:
"Good tidings to the one who has believed in me and seen me; and good tidings seven times over to the one who has believed in me and has not seen me." (Musnad Ahmad)
I came across these hadith in Muntakhab Ahadith compiled by Maulana Muhammad Yusuf Khandhlawi