(30) باب مَنْ لاَ تَجُوزُ شَهَادَتُهُ
It was narrated from 'Amr bin Shuaib from his father that his grandfather said:
"The Testimony of a man or woman who is treacherous, or of one who has been subjected to one of the Haad punishments of Islam, or of one who bears a grudge against his brother, is not permissible."
Reference: Sunan Ibn Majah 2366
In-book reference: Book 13, Hadith 59
English translation: Vol. 3, Book 13, Hadith 2366