Sayyiduna Khabbab (may Allah be pleased with him) said: "We feared that the worldly things we have obtained after the Messenger of Allah (peace and blessings be upon him) would take away the rewards we earned (by being) with the Messenger of Allah (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3664