O ye who believe! Be ye staunch in justice, witnesses for Allah, even though it be against yourselves or (your) parents or (your) kindred, whether (the case be of) a rich man or a poor man, for Allah is nearer unto both (them ye are). So follow not passion lest ye lapse (from truth) and if ye lapse or fall away, then lo! Allah is ever Informed of what ye do.
The Holy Qur'an 4;135