Jami` at-Tirmidhi 428
جامع الترمذي#428SahihUmm Habibah the wife of the Prophet (S) narrated that:She heard Allah's Messenger (S) saying: "Whoever maintains four Rak'ah before Az-Zuhr and four after it, Allah makes him prohibited for the Fire
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
In-book reference: 2:281