This Day, We shall seal up their mouths, and their hands will speak to Us, and their legs will bear witness to what they used to earn.
This will be the state of the disbelievers and hypocrites on the Day of Resurrection, when they deny the sins they committed in this world and swear that they did not do that. Allah will seal their mouths and cause their limbs to speak about what they did.
Ibn Abi Hatim recorded that Anas bin Malik, may Allah be pleased with him, said,
"We were with the Prophet and he smiled so broadly that his molar could be seen, then he said;
Do you know why I am smiling?
We said, `Allah and His Messenger know best.'
He said;
مِنْ مُجَادَلَةِ الْعَبْدِ رَبَّهُ يَوْمَ الْقِيَامَةِ يَقُولُ رَبِّ أَلَمْ تُجِرْنِي مِنَ الظُّلْمِ
فَيَقُولُ بَلَى
فَيَقُولُ لَا أُجِيزُ عَلَيَّ إِلاَّ شَاهِدًا مِنْ نَفْسِي
فَيَقُولُ كَفَى بِنَفْسِكَ الْيَوْمَ عَلَيْكَ حَسِيبًا وَبِالْكِرَامِ الْكَاتِبِينَ شُهُودًا
فَيُخْتَمُ عَلَى فِيهِ وَيُقَالُ لاَِرْكَانِهِ انْطِقِي فَتَنْطِقَ بِعَمَلِهِ ثُمَّ يُخَلَّى بَيْنَهُ وَبَيْنَ الْكَلَمِ فَيَقُولُ
بُعْدًا لَكُنَّ وَسُحْقًا فَعَنْكُنَّ كُنْتُ أُنَاضِل
Because of the way a servant will argue with his Lord on the Day of Resurrection. He will say, "O Lord, will You not protect me from injustice!"
(Allah) will say, "Of course."
He will say, "I will not accept any witness against me except from myself."
(Allah) will say, "Today you will be a sufficient witness against yourself, and the honorable scribes will serve as witnesses against you."
Then his mouth will be sealed, and it will be said to his faculties, "Speak!" So they will speak of what he did. Then he will be permitted to speak, and he will say,
"May you be doomed! It was for you that I was fighting."
This was recorded by Muslim and An-Nasa'i.
Ibn Jarir narrated that Abu Musa Al-Ash`ari, may Allah be pleased with him, said,
"The believer will be called to account on the Day of Resurrection, and his Lord will show him his deeds, just between him and His Lord. He will admit it and will say, `Yes, O Lord, I did do that.'
Then Allah will forgive him his sins and conceal them, and no creature on earth will see any of those sins, but his good deeds will be seen, and he will want all the people to see them.
Then the disbeliever and the hypocrite will be brought to account, and his Lord will show him his deeds and he will deny them, saying, `O Lord, by Your glory, this angel has written down things that I did not do.'
The angel will say to him, `Did you not do such and such on such a day and in such a place?'
He will say, `No, by Your glory, I did not do that.' When he says this, Allah will seal his mouth."
Abu Musa Al-Ash`ari, may Allah be pleased with him, said,
"I think that the first part of his body to speak will be his right thigh."
Then he recited;
الْيَوْمَ نَخْتِمُ عَلَى أَفْوَاهِهِمْ وَتُكَلِّمُنَا أَيْدِيهِمْ وَتَشْهَدُ أَرْجُلُهُمْ بِمَا كَانُوا يَكْسِبُونَ
(This Day, We shall seal up their mouths, and their hands will speak to Us, and their legs will bear witness to what they used to earn).
وَلَوْ نَشَاء لَطَمَسْنَا عَلَى أَعْيُنِهِمْ فَاسْتَبَقُوا الصِّرَاطَ فَأَنَّى يُبْصِرُونَ