It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, visited a household of the Ansar and ate food with them. When he was about to leave, he instructed regarding a place in the house, so a mat was spread there and water was sprinkled on that mat. The Prophet, peace and blessings be upon him, performed voluntary prayer on it and supplicated for them.