The Peak of Eloquence · Hadith 1242 (#Passage #51)
Chapter 14 | To the army before the Battle of Siffin
لَا تُقَاتِلُوهُمْ حَتَّى يَبْدَءُوكُمْ، فَإِنَّكُمْ بِحَمْدِ اللهِ عَلَى حُجَّةٍ، وَتَرْكُكُمْ إِيَّاهُمْ حَتَّى يَبْدَءُوكُمْ حُجَّةٌ أُخْرَى لَكُمْ عَلَيْهِمْ،
Do not fight them unless they initiate the fighting, because, by the grace of Allāh, you are in the right and to leave them till they begin fighting will be another point from your side against them.
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).