Ubaidullah bin Adi bin Al-Khiyar says that Sayyiduna Uthman (may Allah be pleased with him) said to him, "Nephew! Did you meet the Prophet (peace be upon him)?" I replied, "No! But I do have pure information about him and such certainty as a virgin girl has in her veil." Upon this, Sayyiduna Uthman (may Allah be pleased with him), after praising Allah and bearing witness to the two testimonies, said: "Allah Almighty sent Muhammad (peace be upon him) with the truth. I was among those who responded to the call of Allah and His Messenger, and I was also among those who believed in the Shariah of the Prophet (peace be upon him). Then I migrated to Abyssinia both times. I also had the honor of being the son-in-law of the Prophet (peace be upon him), and I pledged allegiance at the blessed hand of the Prophet (peace be upon him). By Allah! I never disobeyed him nor deceived him, until Allah called him to Himself."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 480