NT.filter - nkjv unknown:

nkjv@Acts:17:23 @ for as I was passing through and considering the objects of your worship, I even found an altar with this inscription: TO THE UNKNOWN GOD. Therefore, the One whom you worship without knowing, Him I proclaim to you:

nkjv@2Corinthians:6:9 @ as unknown, and yet well known; as dying, and behold we live; as chastened, and yet not killed;

nkjv@Galatians:1:22 @ And I was unknown by face to the churches of Judea which were in Christ.