لَا تَشْهَدَنَّ عَلَى شَهَادَةٍ حَتَّى تَعْرِفَهَا كَمَا تَعْرِفُ كَفَّكَ[1].
Hadith.3359 - It is narrated from Ali ibn Ghurab, from Abu Abdillah (as): Imam (as) said: "Do not testify to a testimony until you know it as clearly as you know your own palm."
لِأَبِي الْحَسَنِ الْمَاضِي ع يُشْهِدُنِي هَؤُلَاءِ عَلَى إِخْوَانِي قَالَ نَعَمْ أَقِمِ الشَّهَادَةَ لَهُمْ وَ إِنْ خِفْتَ عَلَى أَخِيكَ ضَرَراً.
I said to Abu al-Hasan al-Madhi (as) (Imam Musa ibn Jafar Al-Kadhim (as)): "These people call me to testify against my brothers." Imam (as) said: 'Yes, establish the testimony for them, even if you fear harm for your brother.'"
قُلْتُ لِأَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ رَجُلٌ يُشْهِدُنِي عَلَى اَلشَّهَادَةِ فَأَعْرِفُ خَطِّي وَ خَاتَمِي وَ لاَ أَذْكُرُ مِنَ اَلْبَاقِي قَلِيلاً وَ لاَ كَثِيراً فَقَالَ "إِذَا كَانَ صَاحِبُكَ ثِقَةً وَ مَعَكَ رَجُلٌ ثِقَةٌ فَاشْهَدْ لَهُ".
I said to Abu Abdullah (as): "A man calls me to testify, and I recognize my handwriting and my seal, but I do not remember anything else, whether little or much." Imam (as) said: 'If your companion is trustworthy and you have another trustworthy man with you, then testify for him.'"