Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that two men brought a dispute to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "I am only a human being; I judge between you on the basis of what I hear from you. It may be that one of you is more eloquent in presenting his argument than his brother; so if I (being influenced by his polished speech) rule in someone's favour for part of his brother's right, then in reality I am cutting off for him a piece of the Fire."
This hadith is not narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) except with this chain, and al-Qasim bin Abdullah bin Umar (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب العين / 4890
Hadith Gradingمحدثین:إسناده ضعيف جدًّا، فيه القاسم بن عبد الله العمري متروك
Hadith Takhrij«قال الهيثمي: وفيه القاسم بن عبد الله بن عمر وهو متروك «مجمع الزوائد ومنبع الفوائد، ج 4، ص 198»»