'Witness' in the Bible

And as for myself, brethren, when I came to you, it was not with surpassing power of eloquence or earthly wisdom that I came, announcing to you that which God had commanded me to bear witness to.

Nay more, we are actually being discovered to be bearing false witness about God, because we have testified that God raised Christ to life, whom He did not raise, if in reality none of the dead are raised.