Yes.

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Reference:Jami` at-Tirmidhi 458 Aishah narrated: “The night prayer of Allah’s Messenger was thirteen Rak’ah, five of which were his Witr, not sitting in any of them except at the end of them. When the Mu’adh-dhin called the Adhan he would stand to perform two light (Rak’ah).” Does this Hadith mean we don’t sit down until last Rakah of witr ?

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