Remembrance immediately after salam of the witr prayer

the messenger of allah r would recite (the following chapters) during the witr prayer:

( sabbih isma rabbika al-aaala ….) 

[al-aaala]

( qul ya ayyuha alkafiroon …..)      

[al-kafiroon]

( qul huwa allahu ahad …..)          

[al-ikhlas]

…after giving salam he would supplicate three times:

subhanal-malikil-quddoos.(three times).

‘how perfect the king, the holy one is.’    (three times)

…on the third time he would raise his voice, elongate it and add:

rabbil-mala-ikati warrooh.          

‘lord of the angles and the rooh (i.e. jibra-eel).