It is narrated from Sayyiduna Habib bin Mukhnaf (may Allah be pleased with him), he says: When I reached the Prophet Muhammad (peace and blessings be upon him) on the day of Arafah, he (peace and blessings be upon him) was saying: "Do you know this?" I do not know what the people replied to him (peace and blessings be upon him), then he (peace and blessings be upon him) said: "It is obligatory upon every household to slaughter one goat in the month of Rajab and one goat on the occasion of Eid al-Adha."