Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said:
مَنْ أُفْتِيَ بِغَيْرِ عِلْمٍ كَانَ إِثْمُهُ عَلَى مَنْ أَفْتَاهُ وَمَنْ أَشَارَ عَلَى أَخِيهِ بِأَمْرٍ يَعْلَمُ أَنَّ الرُّشْدَ فِي غَيْرِهِ فَقَدْ خَانَهُ
Whoever is given an opinion not based on knowledge, his sin falls upon the one who gave him the opinion. Whoever directs his brother to a matter of which he knows good lies elsewhere, he has betrayed him.
Source: Sunan Abī Dāwūd 3657, Grade: Hasan
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