Are you a witness for Jesus?

Isaiah 43:10-12 (KJV)
Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me.
I, even I, am the LORD; and beside me there is no saviour.
I have declared, and have saved, and I have shewed, when there was no strange god among you: therefore ye are my witnesses, saith the LORD, that I am God.

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