The Office of the Judge (Kitab Al-Aqdiyah)
Dawud :: Book 24 : Hadith 3593
Narrated Abdullah ibn Amr ibn al-'As:
The Apostle of Allah (peace_be_upon_him) rejected the testimony of a deceitful man and woman, of one who harbours rancour against his brother, and he rejected the testimony of one who is dependent on a family, and he allowed his testimony for other.