Al-Kāfi
Hadith 5755- ابْنُ مَحْبُوبٍ عَنْ إِبْرَاهِيمَ بْنِ نُعَيْمٍ الأزْدِيِّ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنْ أَرْبَعَةٍ شَهِدُوا عَلَى رَجُلٍ بِالزِّنَى فَلَمَّا قُتِلَ رَجَعَ أَحَدُهُمْ عَنْ شَهَادَتِهِ قَالَ فَقَالَ يُقْتَلُ الرَّابِعُ وَيُؤَدِّي الثَّلاثَةُ إِلَى أَهْلِهِ ثَلاثَةَ أَرْبَاعِ الدِّيَةِ.
5. Ibn Mahbub has narrated from Ibrahim ibn Nu’aym al-’Azdiy who has narrated the following: “I once asked abu ‘Abd Allah (a.s.), about the case of four witnesses who testify against a man to have committed fornication and when he is executed, one of them retracts his testimony. He (the Imam) said, ‘The fourth one among them is executed and the other three must pay three-fourth of wergild to his family of the fourth witness.’”