Sayyiduna Tariq bin Shihab (may Allah be pleased with him) narrated: Some of the remaining Companions of the Messenger of Allah (peace and blessings be upon him) came to visit Khabbab (may Allah be pleased with him) in his illness, and they said: Rejoice, O Abu Abdullah! Tomorrow you will join your brothers. The narrator said: He wept, then said: "Those people passed away with their rewards complete, and I fear that my reward for those deeds may be what (of the world) has been given to us after them."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3603