Narrated 'Abdullah bin 'Amr (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 .‏ [1]‏ .‏