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Du'a immediately after salam of the witr prayer

For those unfamiliar, Hisnul Muslim (Fortress of the Muslim) is a well-known du'a book compiled by Said Bin Ali Bin Wahf Al-Qahtani. It categorizes authentic supplications that the Prophet ﷺ made in various situations. In the 33rd chapter, "Immediately after salam of the witr prayer" there are 1 supplications that you can learn and recite.

Tips for learning:

We've created a video for each du'a to try and make it easy to learn. There's also transliteration and translation for every du'a. Lastly, after pressing the play button you can tap on any word and it'll skip to that part in the audio.

Chapter 33: Immediately after salam of the witr prayer
1 du'a
'سبحان الملك القدوس' ثلاث مرات والثالثة يجهر بها ويمد بها صوته 'ربِّ الملائكةِ والرّوح'
Subḥāna ‘l-Maliki ‘l-Quddūs. [Recite three times, and raise and extend the voice on the third time and say...] Rabbi ‘l-Malā'ikati war-rūh.
Glory is to the King, the Holy.[Recite three times in Arabic, and raise and extend the voice on the third time and say...] Lord of the angels and the Spirit.
An-Nasa'i 3/244, Ad-Daraqutni and others. The final addition is from Ad-Daraqutni's version 2/ 31 and its chain of narration is authentic. See the checking of Zadul-Ma'ad by Shu'aib Al-Arna'ut and 'Abdul-Qadir Al-Arna'ut 1/337.
Hisnul Muslim 119