Jami` at-Tirmidhi 783
جامع الترمذي#783SahihAishah narrated:"I would not make up what was due upon me from Ramadan except in Sha'ban, until the Messenger of Allah died
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 8:102