Salim Sablān, may Allah have mercy on him, says: We were traveling towards Makkah Mukarramah with Sayyidah Aisha, may Allah be pleased with her. Sayyidah used to travel with Abu Yahya Taymi, and he would lead her in prayer. One day we met Abdur Rahman bin Abu Bakr Siddiq, may Allah be pleased with him, and he performed an incomplete ablution. Sayyidah Aisha, may Allah be pleased with her, said to him: "O Abdur Rahman! Complete your ablution, for I heard the Messenger of Allah, peace and blessings be upon him, say: 'Woe to the heels from the Fire on the Day of Resurrection.'"
Abu Salamah (may Allah have mercy on him) says: When Sayyiduna Abdur Rahman (may Allah be pleased with him) performed ablution in the presence of Sayyidah Aisha (may Allah be pleased with her), she said to him: "O Abdur Rahman! Perform ablution completely, for I heard the Messenger of Allah (peace and blessings be upon him) say: 'Woe to the heels (and upper parts of the feet) from the Fire.'"
It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) saw some people who had performed ablution but water had not reached their heels, so he (peace and blessings be upon him) said: "Woe to the heels from the Fire."
It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) saw some people who had performed ablution, but the dryness of their heels was clearly visible, so he (peace and blessings be upon him) said: "Woe to the heels from the Fire! Perform ablution thoroughly."
It is narrated from Sayyiduna Abdullah bin Harith (may Allah be pleased with him), the Messenger of Allah (peace and blessings be upon him) said: "Woe from the Fire to the heels and the soles of the feet."
It is narrated from Sayyiduna Ubaidah bin Amr Kalabi (may Allah be pleased with him), he says: I saw the Noble Prophet (peace and blessings be upon him) performing ablution, and he (peace be upon him) would perform ablution completely. On this basis, when Rubaiyyah would perform ablution, she would wash each limb thoroughly, to the extent that she would lift her scarf and wipe her head.