作证

作证	zuò zhèng	to bear witness; to testify / to serve as evidence
作	zuō	(bound form) worker / (bound form) workshop / (slang) troublesome; high-maintenance (person)
作	zuò	to do; to engage in / to write; to compose / to pretend; to feign / to regard as; to consider to be / to be; to act the part of / to feel (itchy, nauseous etc) / writings; works
证	zhèng	to admonish / variant of 证
证	zhèng	certificate / proof / to prove / to demonstrate / to confirm / variant of 症