Al-Kāfi - Volume 7 > The Case of One who Testifies, then Retracts it
Hadith #8

8- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عَاصِمِ بْنِ حُمَيْدٍ عَنْ مُحَمَّدِ بْنِ قَيْسٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلام) قَالَ قَضَى أَمِيرُ الْمُؤْمِنِينَ (عَلَيْهِ السَّلام) فِي رَجُلٍ شَهِدَ عَلَيْهِ رَجُلانِ بِأَنَّهُ سَرَقَ فَقَطَعَ يَدَهُ حَتَّى إِذَا كَانَ بَعْدَ ذَلِكَ جَاءَ الشَّاهِدَانِ بِرَجُلٍ آخَرَ فَقَالا هَذَا السَّارِقُ وَلَيْسَ الَّذِي قَطَعْتَ يَدَهُ إِنَّمَا شَبَّهْنَا ذَلِكَ بِهَذَا فَقَضَى عَلَيْهِمَا أَنْ غَرَّمَهُمَا نِصْفَ الدِّيَةِ وَلَمْ يُجِزْ شَهَادَتَهُمَا عَلَى الآخَرِ.

8. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from ‘Asem ibn Humayd from Muhammad ibn Qays who has narrated the following: “This is about the case of a man against whom two men had testified for theft, thus his hand was cut off and thereafter the two witnesses brought another man saying that this was the thief and not the one whose hand was cut off but we were only confused about it. Abu Ja’far, ‘Alayhi al-Salam, has said that ’ Amir al-Mu’minin, Ali, Alayhi al-Salam, issued a judgment. It required the two to pay one-half of the wergild and did not accept their testimony against the other man.’”