Chapter on Testimony Based on Testimony
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 1|Chapter 30
وَ سَأَلَ صَفْوَانُ بْنُ يَحْيَى أَبَا اَلْحَسَنِ عَلَيْهِ اَلسَّلاَمُ: عَنْ رَجُلٍ أَشْهَدَ أَجِيرَهُ عَلَى شَهَادَةٍ ثُمَّ فَارَقَهُ أَ تَجُوزُ شَهَادَتُهُ بَعْدَ أَنْ يُفَارِقَهُ قَالَ "نَعَمْ" قُلْتُ فَيَهُودِيٌّ أُشْهِدَ عَلَى شَهَادَةٍ ثُمَّ أَسْلَمَ أَ تَجُوزُ شَهَادَتُهُ قَالَ "نَعَمْ".
Safwan ibn Yahya asked Abu al-Hasan عليه السلام: 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 عليه السلام 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 عليه السلام said: "Yes."
- Ṣaḥīḥ al-Faqīh, p. 190