"Allah orders that you return trusts to their owners and that if you judge among people, you judge justly". (An-Nisa4:58)
And do not let hatred of any people dissuade you from dealing justly. Deal justly, for that closer to God-consciousness." (Al-maa'idah,5:9)
"O you who believe! Be firm in justice as witnesses for God, even in case against yourself, your parents or your kin."(An-Nisa,4:135)
And if you give your words, you must be just, even though it be against your kin, fulfil the covenant of God. For that is what he have commanded you that you may remember. (Al-An'aam,6-152)