Sulayman bin Musa (may Allah have mercy on him) narrates with his chain that the Messenger of Allah (peace and blessings be upon him) said: "The testimony of a treacherous man or woman, an adulterer or adulteress, and one who harbours rancour against his brother shall not be accepted."
(b) In the narration of Abu Abdullah there is: "in Islam."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20856