Sayyiduna Abu Jum'ah (may Allah be pleased with him) narrates: We ate a meal with the Messenger of Allah (peace and blessings be upon him), and Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with him) was with us. He said: O Messenger of Allah, is there anyone better than us, who believed with you? He (peace and blessings be upon him) said: "Yes, people who will come after you, who will believe in me although they will not have seen me."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3524