Musannaf Ibn Abi Shaybah 37144 — Reports from our Prophet

It is narrated from Sayyiduna Ubayd bin Khalid al-Sulami (may Allah be pleased with him), who said: The Messenger of Allah (peace and blessings be upon him) established brotherhood between two men. Then one of them was killed (in the path of Allah) and the other died after him. We offered the funeral prayer for him. The Messenger of Allah (peace and blessings be upon him) asked: "What did you say?" The Companions (may Allah be pleased with them) said: We prayed for him: O Allah, join him with his companion. He (peace and blessings be upon him) said: "Then where will his prayers go, after his (earlier) prayers? And where will his fasts go, after his fasts? And where will his deeds go, after his deeds?" The narrator was in doubt about the fasting. "The deeds between the two are like what lies between the heavens and the earth."