Hadith #3549 (Sahih al-Bukhari)
Book: Companions of the Prophet
Narrator(s): Ubaida bin 'Amr al-Salamani عبيدة بن عمرو
Grade: Sahih

Ali said (to the people of ‘Iraq), “Judge as you used to judge, for I hate differences (and I do my best ) till the people unite as one group, or I die as my companions have died.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-3549/