Sufyan narrates: Aswad bin Qais was sitting in the sun during the winter season, picking out his lice. He narrated this hadith to us. He says: I heard Sayyiduna Jundub Bajali (may Allah be pleased with him) narrate this, he says: I was present with the Prophet Muhammad (peace and blessings be upon him) on the occasion of Eid, and he came to know that some people had sacrificed animals before the prayer. So the Prophet (peace and blessings be upon him) said: "Whoever slaughtered the animal before the prayer should offer the sacrifice again, and whoever has not yet slaughtered, let him now slaughter in the name of Allah."