Al-Kāfi - The Book on Virtue of Knowledge

Al-Kāfi - The Book on Virtue of Knowledge Chapter: Prohibition on Speaking without Knowledge. َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َدَ وَعَبْدِ الله ابْنَيْ ٠َّدِ بْنِ عِيسَى عَنْ عَلِيِّ بْنِ الْحَكَ٠ِ عَنْ سَيْفِ بْنِ عَ٠ُفَضَّلِ بْنِ يَزِيدَ قَالَ قَالَ لِي أَبُو عَبْدِ الله (عَلَيْهِ السَّلا٠) أَنْهَاكَ عَنْ خَصْلَتَيْنِ فِيهِ٠َا هَلاكُ الرِّجَالِ أَنْهَاكَ أَنْ تَدِينَ الله بِالْبَاطِلِ وَتُفْتِيَ النَّاسَ بِ٠1.

Muhammad ibn Yahya has narrated from Ahmad and ‘Abdallah (both) sons of Muhammad ibn ‘Isa from Ali ibn al-Hakam from Sayf ibn ‘Umayra from Mufaddal ibn Yazid that Abu ‘Abdillah (al-Sadiq) (as) said: "I would like to warn you about two forms of behavior that lead a man to destruction.

I prohibit you from dealing with Allah on the basis of falsehood and from giving fatwa to people without knowledge.” صحيح - Shaykh Baqir al-Behbudi (Sahih al-Kafi (1/5)) جهول - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (1/136))