NET
23 For as I went around and observed closely your objects of worship, I even found an altar with this inscription: ‘To an unknown god.’ Therefore what you worship without knowing it, this I proclaim to you.
Darby
23 for, passing through and beholding your shrines, I found also an altar on which was inscribed, To the unknown God. Whom therefore ye reverence, not knowing [him], him I announce to you.
KJV
23 For as I passed by, and beheld your devotions, I found an altar with this inscription, TO THE UNKNOWN GOD. Whom therefore ye ignorantly worship, him declare I unto you.