Jami` at-Tirmidhi 426
جامع الترمذي#426SahihAishah narrated:"When the Prophet (S) would not perform the four Rak'ah before Az-Zuhr he would pray them after it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan
Al-AlbaniHasan
Bashar Awad MaaroufHasan
Zubair Ali ZaiIsnaad Sahih
In-book reference: 2:279