Jami` at-Tirmidhi 3166
جامع الترمذي#3166SahihNarrated Abu Hurairah:that the Messenger of Allah (ﷺ) said: "Ibrahim, peace be upon him, did not lie about anything at all - except for three: 'Verily I am sick (37:89)' while he was not sick. And his saying about Sarah: 'She is my sister' and his saying: 'Nay, this one, the biggest of them did it (21:)
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: 47:218