Abd al-Rahman bin Bishr (may Allah have mercy on him) said: Two men entered through the gate of Kindah while Abu Mas'ud al-Ansari (may Allah be pleased with him) was sitting in a circle. The narrator said: They said: Let some man judge between us. A man from that gathering said: I will. So Abu Mas'ud (may Allah be pleased with him) took a handful of pebbles, threw them at him and said: Stop! For haste in judgement is disliked.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20252