Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) said: "Three men of Quraysh were the most handsome of face, the finest in character, and the most modest among Quraysh; if they spoke to you they did not lie, and if you spoke to them they did not take you for a liar: Abu Bakr al-Siddiq, Abu Ubaydah bin al-Jarrah, and Uthman bin Affan (may Allah be pleased with them)."
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 16