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Islam has established rulings pertaining to testimony to insure achieving justice and eliminate the possibility of favoritism or oppression. Islam considers perjury as a cardinal sin. The article discusses this in detail.
There are certain conditions required in a witness: Islam, adulthood and sanity, speech, accuracy and good memory, probity. Testimony of people of earlier divine religions is acceptable in certain cases.
Giving testimony pertaining to the rights of human beings is a collective duty, witnesses must not refuse when they are called in. it is an obligation if one is summoned to testify which confirms Islam's protection of rights.
Certain values must be observed by judges. Anything that may blur the judge's fairness should be avoided whether anger, fear, etc. Rulings have to be based on the Quran, and Sunnah, unanimity, Ijtihad, or a fatwa by a qualified Mufti.
Islam stipulates certain conditions in judges to assume their positions such as: Islam, sanity and adulthood, probity, sound constitution, Knowledge of the Quran and Sunnah, and a degree of scholarship to exercise Ijtihad.
The basis of the justice system is the Qura'n, Sunnah and unanimity of scholars. It is important to appoint judges to settle disputes which earn great reward from God because it supports rights and combats corruption.