Sahih Ibn Khuzaymah

Abu Hurairah (may Allah be pleased with him) narrates that the Messenger of Allah (peace be upon him) said: "When any one of you has recited the Tashahhud, he should seek refuge with Allah from four things. He should supplicate in this way « اللّٰهُمَّ إِنِّي أَعُوذُ بِكَ مِنْ عَذَابِ جَھَنَّمَ وَ مِنْ عَذَابِ الْقَبْرِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَسِيحِ الدَّجَّالِ، وَأَعُوذُ بِكَ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ »: 'O Allah, I seek refuge with You from the punishment of Hell, from the punishment of the grave, from the evil of the trial of the False Messiah (Dajjal), and from the evil of the trials of life and death.' This is the narration of Waki’."

Hazrat Sayyiduna Ibn Tawoos narrates from his father that he used to recite some words after Tashahhud and gave them great importance. I asked, "Did he recite them in both Tashahhuds?" He replied, "(No), rather he would recite them only after the Tashahhud in the last two rak‘ahs." I asked, "What are those words?" He said, « أَعُوذُ بِاللهِ مِنْ عَذَابِ الْقَبْرِ، وَأَعُوذُ بِاللهِ مِنْ عَذَابِ جَھَنَّمَ ، وَأَعُوذُ بِاللهِ مِنْ شَرِّ الْمَسِيحِ الدَّجَّالِ، وَأَعُوذُ بِاللهِ مِنْ عَذَابِ الْقَبْرِ، وَأَعُوذُ بِاللهِ مِنْ فِتْنَةِ الْمَحْيَا وَالْمَمَاتِ » "I seek refuge with Allah from the punishment of the grave, and I seek refuge with Allah from the punishment of Hell, and I seek refuge with Allah from the evil of the false messiah (Dajjal), and I seek refuge with Allah from the punishment of the grave, and I seek refuge with Allah from the trials of life and death." He says that he gave great importance to these words (and would recite them with great care). Ibn Jurayj says that he narrated this hadith to me from Sayyidah Aisha (may Allah be pleased with her) from the Prophet Muhammad (peace and blessings be upon him).