And when will it be obligatory for them to perform ghusl and wudu, and to attend the congregation, the two Eids, funerals, and to participate in their rows, and how will it be?

Narrated Sulaiman Ash-Shaibani: I heard Ash-Shu`bi saying, "A person who was accompanying the Prophet passed by a grave that was separated from the other graves told me that the Prophet once led the people in the (funeral) prayer and the people had aligned behind him. I said, "O Aba `Amr! Who told you about it?" He said, "Ibn `Abbas."