من لا يحضره الفقيه, volume 3, page 70

Hadith.3352 - Ghiyath ibn Ibrahim narrated from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father Imam Muhammad ibn Ali Al-Baqir (as): "Indeed, Imam Ali (as) would not validate the testimony of one man based on the testimony of another man, except if there were two men testifying based on testimony of one man."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3353 - It is narrated from Abdullah ibn Sinan, from Abdurrahman ibn Abi Abdullah, from Abu Abdullah (as) regarding a man who testified based on the testimony of another man, and then the original man said: 'I did not make him a witness,' Imam (as) said: "The testimony of the more upright of the two is accepted, but if their uprightness is equal, then his testimony is not accepted."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

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."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3355 - Al-Ala narrated from Muhammad ibn Muslim: He said: I asked Abu Ja'far Imam Muhammad ibn Ali Al-Baqir (as) about a dhimmi (non-Muslim under Islamic protection) and a slave who bore witness to a testimony. Then the dhimmi embraced Islam and the slave was emancipated, would their testimony about what they were made witnesses to before be valid? Imam (as) said: "Yes, if goodness is known from them afterward, their testimony is valid."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.

Hadith.3356 - Ghiyath ibn Ibrahim narrated from Imam Jafar ibn Muhammad Al-Sadiq (as) from his father Imam Muhammad ibn Ali Al-Baqir (as): Imam Ali ibn Abi Talib (as) said: "Testimony upon testimony is not valid in cases involving prescribed punishments (hudud), nor is sponsorship (kafalah) valid in cases involving prescribed punishments."

Translation: Bab Ul Qaim Publications — attributed by Thaqalayn·The Arabic above is the original.