Hadith.3354 - Safwan ibn Yahya asked Abu al-Hasan (as): About a man who made his employee a witness to a testimony and then separated from him, would his testimony be valid after their separation? Imam (as) said: "Yes." He further asked: What if a Jew was made a witness to a testimony and then embraced Islam, would his testimony be valid? Imam (as) said: "Yes."