The Prophet (peace and blessings of Allaah be upon him) recited this supplication to one of his companions.

Sayyid ibn Tawoos narrated in the book Mahj al-Dawaat, p. 130 that the Prophet taught this supplication to one of his companions. When Hajjaj became ruler and wanted to kill him, he recited this supplication and Hajjaj's swordsman was unable to kill him.

The supplication is:

يَا سَامِعَ كُلِّ صَوْتٍ يَا مُحْيِيَ النُّفوسِ بَعْدَ الْمَوْتِ يَا مَنْ لَا يَعْجَلُ لأَنَّهُ لَا يَخَافُ الْفوْتَ يَا دَائِمَ الثَّبَاتِ يَا مُخْرِجَ النَباتِ يَا مُحْيِيَ الْعِظَامِ الرَّميمِ الدَّارِسَاتِ بِسْمِ اللَّهِ اعْتَصَمْتُ بِاللَّهِ وَ تَوَكَّلْتُ عَلَى الْحَيِّ الَّذِي لَا يَمُوتُ وَرَمَيْتُ كُلَّ مَنْ يُؤْذِينِي بِلا حَوْلَ وَلَا قُوَّةَ إِلَّا بِاللَّهُ الْعَلي العظيم.

Translation:

O Hearer of all sounds, O Giver of life to souls after death, O He Who is in no hurry, for He fears no loss. O Ever-Sustainer; O Bringer of vegetation, O Giver of life to decayed and perished bones. In the blessed name of God, I have clung to God and relied on the Living One who never dies, and I have repelled whoever intends to harm me with the blessed phrase, “There is no power and no strength except with the power and might of God, the Most High, the Great.”