Narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: The testimony of a deceitful man or woman is not permissible, nor of one who harbors malice in his heart against his brother. Similarly, the testimony of a person who is a servant and subordinate of a family is also not permissible. Apart from these, the testimony of all other individuals is permissible. By "al-qani‘" is meant the person upon whom the household spends. In another narration: The Messenger of Allah (peace and blessings be upon him) rejected the testimony of the one who is a servant and subordinate of a household in favor of the household, and declared the testimony of the rest of the individuals permissible.

(Second chain) The Messenger of Allah, peace and blessings be upon him, said: The testimony of a treacherous person is not permissible, nor of the one upon whom a legal punishment has been carried out in Islam, nor of the one who harbors malice against his brother.