Hadith 14:20
Narrated 'Abdullah bin 'Umar (RA):
Allah's Messenger (ﷺ) said: "It is not permissible to accept the testimony of a man or a woman who does not fulfill their trusts, or of one who harbors a grudge against his brother, or the testimony of one who is dependent on a family (to testify) for members of the family." [Reported by Ahmad and Abu Dawud].
وَعَنْ عَبْدِ اَللَّهِ بْنِ عَمْرٍو رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ "لَا تَجُوزُ شَهَادَةُ خَائِنٍ, وَلَا خَائِنَةٍ, وَلَا ذِي غِمْرٍ عَلَى أَخِيهِ, وَلَا تَجُوزُ شَهَادَةُ اَلْقَانِعِ لِأَهْلِ اَلْبَيْتِ" } رَوَاهُ أَحْمَدُ, وَأَبُو دَاوُدَ
Original Reference: Bulugh al-Maram 1416