'Testify' in the Bible

To whom shall I speak and testify, that they may hear? behold, their ear is uncircumcised, and they cannot hearken: behold, the word of Jehovah is become unto them a reproach; they have no delight in it.

Though our iniquities testify against us, work thou for thy name's sake, O Jehovah; for our backslidings are many; we have sinned against thee.