Chapter on Freedom
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 1|Chapter 51
وَ رُوِيَ عَنْ أَحْمَدَ بْنِ هِلاَلٍ قَالَ: كَتَبْتُ إِلَى أَبِي اَلْحَسَنِ عَلَيْهِ اَلسَّلاَمُ كَانَ عَلَيَّ عِتْقُ رَقَبَةٍ فَهَرَبَ لِي مَمْلُوكٌ لَسْتُ أَعْلَمُ أَيْنَ هُوَ أَ يُجْزِينِي عِتْقُهُ فَكَتَبَ عَلَيْهِ اَلسَّلاَمُ "نَعَمْ ".
It is narrated from Ahmad bin Hilal, who said: "I wrote to Abu al-Hasan عليه السلام, stating that I was obligated to free a slave, but my slave had escaped, and I did not know where he was. Would his emancipation suffice for fulfilling my obligation?" Imam عليه السلام wrote back: 'Yes.' "
- Ṣaḥīḥ al-Faqīh