Lady Aisha (may Allah be pleased with her) narrated that the Messenger of Allah (peace and blessings be upon him) said: "Whenever Ammar was given the choice between two matters, he chose the one that was most rightly guided."
Hadith Referenceسلسله احاديث صحيحه / الفتن و اشراط الساعة والبعث / 3539