It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "On the Day of Resurrection, the lightest punishment among the people of Hell will be for a man who will be made to wear two shoes of fire, from the heat of which his brain will be boiling on the Day of Resurrection." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it. And it has supporting reports from Sayyiduna Abdullah bin Abbas, Sayyiduna al-Nu'man bin Bashir and Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with them) from the Messenger of Allah (peace and blessings be upon him) with different wordings. As for the hadith of Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him):

It is narrated from Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him); he said that the Messenger of Allah (peace and blessings be upon him) said: "The lightest punishment among the people of Hell will be for the one who will be made to wear two shoes and two straps of fire; from their heat his brain will boil as a cooking pot boils. And he will think that no one in Hell is receiving a more severe punishment than he, whereas he will be receiving the lightest punishment."

It is narrated from al-A'mash; he said: I heard Khaythamah also mentioning this same hadith from Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him). This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it!

It is narrated from Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him) that he was delivering a sermon and saying: I heard the Messenger of Allah (peace and blessings be upon him) saying: "On the Day of Resurrection, the lightest punishment among the people of Hell will be for a man on the soles of whose feet an ember will be placed, from the heat of which his brain will be boiling." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it!

It is narrated from Sayyiduna al-Nu'man bin Bashir (may Allah be pleased with him); he said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "On the Day of Resurrection, the lightest punishment among the people of Hell will be for a man under the soles of whose feet there will be two embers, from the heat of which his brain will boil as a cooking pot and a copper kettle boil." And as for the hadith of Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him):

It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "On the Day of Resurrection, the lightest punishment among the people of Hell will be for a man who will have been made to wear two shoes of fire, from which his brain will be boiling, and he will also be receiving other portions of the punishment. Among them will be some who will be in the Fire up to their knees along with other portions of the punishment, some who will be in the Fire up to the tip of the nose along with other portions of the punishment, some who will be in the Fire up to the collarbones (the upper part of the chest) along with other portions of the punishment, and among them will be some who will be completely submerged in the Fire." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it. And as for the hadith of Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both):