'Testify' in the Bible

And it shall be, if thou do at all forget Jehovah thy God, and go after other gods, and serve them, and bow down to them, I testify against you this day that ye shall utterly perish.

If an unrighteous witness rise up against any man to testify against him of an offence;

And it shall come to pass, when many evils and troubles have befallen them, that this song shall testify against them as a witness; for it shall not be forgotten out of the mouths of their seed; for I know their imagination which they are forming already this day, before I bring them into the land which I have sworn unto them.

he said unto them, Set your hearts unto all the words that I testify among you this day, which ye shall command your children to take heed to do, all the words of this law.