Could you please mention the Qunūt supplication that we recite in the Witr prayer?

The Qunut supplication is recited in the last rak'ah of the Witr prayer after bowing (rukūʿ), and it is permissible before it, but after it is better. It is sunnah (definition) to raise the hands to the chest, and it is recommended not to be constant in reciting it. The prescribed wording is: "O Allah, guide me among those whom You have guided, and grant me well-being among those whom You have granted well-being, and befriend me among those whom You have befriended, and bless for me what You have given me, and protect me from the evil of what You have decreed. For indeed, You decree and none can decree against You. And indeed, none whom You befriend shall be humiliated, and none whom You oppose shall be honored. Blessed are You, our Lord, and Exalted. There is no refuge from You except to You." Then, one should send prayers upon the Prophet. After the taslim (definition), one says "Subhan al-Malik al-Quddus" (Glory be to the Sovereign, the Most Holy) three times, extending the voice in the third time. It is sunnah to add: "Lord of the angels and the Spirit."