The Sufficient (Vol 7) · Hadith 597 (#Ḥadīth #6)
Chapter 11 | Testimony of Children
6- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ عَنْ جَمِيلٍ قَالَ سَأَلْتُ أَبَا عَبْدِ اللهِ عَنِ الصَّبِيِّ هَلْ تَجُوزُ شَهَادَتُهُ فِي الْقَتْلِ قَالَ يُؤْخَذُ بِأَوَّلِ كَلامِهِ وَلا يُؤْخَذُ بِالثَّانِي.
6. A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from Jamil who has narrated the following: “I once asked abu ‘Abd Allah , about a child if he can testify in the case of murder. He (the Imam) said, ‘His first words are accepted but his second words are not accepted.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).