'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 unto them a reproach; they have no delight in it.

Jehovah, though our iniquities testify against us, do thou act for thy name's sake; for our backslidings are many we have sinned against thee.