Musannaf Ibn Abi Shaybah 40645 — reports on Siffin

Sayyiduna Ammar bin Yasir (may Allah be pleased with him) was saying during the Battle of Siffin: "Whoever wants to receive the wide-eyed maidens of Paradise, let him go forward between the two ranks seeking reward. I see a rank that will strike you with such a blow that the liars will fall into doubt about it. By the One in whose hand is my soul, even if they were to crush us utterly, I would still be certain that I am on the truth and that they are on falsehood."