Al-Kāfi - Volume 7 > Testimony of a Father for his Son or a Son’s Testimony for his Father and Testimony of a brother for his Brother
Hadith #1

1- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ يُونُسَ عَنْ زُرْعَةَ عَنْ سَمَاعَةَ عَنْ أَبِي بَصِيرٍ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) عَنْ شَهَادَةِ الْوَلَدِ لِوَالِدِهِ وَالْوَالِدِ لِوَلَدِهِ وَالأخِ لأخِيهِ قَالَ فَقَالَ تَجُوزُ.

1. Ali ibn Ibrahim has narrated from his father from Muhammad ibn ‘Isa from Yunus from Zur’ah from Sama‘ah from abu Basir who has narrated the following: “I once asked abu ‘ Abd Allah, ‘Alayhi al-Salam, about the testimony of a father for his son or a son’s testimony for his father and the testimony of a brother for his brother. He (the Imam) said, ’It is permissible.’”