Jami` at-Tirmidhi 287
جامع الترمذي#287SahihMalik bin Al-Huwairith Al-Laithi narrated that he saw :Allah's Messenger performing Salat. When he was in an odd number of his Salat, he would not get up until he had sat completely
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 2:139