God says
….And the witnesses must not refuse ( to give evidence) whenever they are called upon… Q.2:282
….And do not conceal what you have witnessed -- for he, who conceals it, is sinful at heart; and God has full knowledge of all that you do. -- Q.2:283
O you who have attained to faith! Be ever steadfast in your devotion to God, bearing witness to the truth in all fairness and justice; and never let hatred of anyone lead you into the sin of deviating from justice. Be just: this is closest to being God-conscious. And remain conscious of God: indeed, God is aware of all that you do. -- Q.5:8
Prophet said
After the morning prayer the messenger of God stood up and said: “False evidence has been equaled to setting up a partner with God.” He repeated it three times. – H: Abu Daud, Ibn Majah, Ahmed and Tirmizi. N: Khuriam-b-Fatek.
“While arguing in front of me one of you may be more eloquent and forceful. Even if I decide in his favor and give him, thus, an (unauthorized) portion from his brothers property, let him not take it because, then, he will be receiving a piece of fire.” -- H: Bukhari and Muslim. N: Umme salamah*
