Narrated by Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: Whoever argues unjustly despite knowing (the truth), he will remain in the displeasure of Allah Almighty until he gives it up.
Hadith Referenceالفتح الربانی / مسائل القضاء والشهادات / 6414
Benefits: … Among us, due to familial and religious prejudice, there are such examples where people become determined to support the oppressor, and do not even refrain from giving false testimonies in his favor in courts and tribunals.