Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: Whoever gives a fatwa without knowledge or understanding, its sin will be upon him (the one who gave the fatwa).
Hadith Takhrijاس اثر کی سند صحیح ہے۔ دیکھئے: [جامع بيان العلم 1626] ، [الفقيه والمتفقه 155/2] ۔ ابوسنان کا نام ضرار بن مرة ہے۔
Brief Explanation
(Commentary on Hadiths 160 to 162) In both these narrations, there is encouragement and warning regarding exercising caution and refraining from issuing legal verdicts (fatwas) without thought, understanding, or knowledge, and from explaining religious matters without evidence and proof.