«إذا جلس إليك الخصمان فسمعت من أحدهما فلا تقض لأحدهما حتى تسمع من الآخر كما سمعت من الأول فإنك إذا فعلت ذلك تبين لك القضاء»
The Prophet (peace and blessings be upon him) said:
"When two disputing parties sit before you (with their case) and you have heard from one of them, do not judge for either of them until you have heard from the other just as you heard from the first, for when you do that, the judgement will become perfectly clear to you."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 478