John 10:16

And other sheep I have, which are not of this fold: them also must I bring, and they shall hear my voice; and they shall become one flock, one shepherd.

Not of this fold ... These are the Gentiles whom Christ would save and who together with the spiritual Israel (a remnant of the whole) would thenceforth compose the one flock of God.

One flock ... The KJV is incorrect in rendering this "one fold." Jesus here changed from the word "fold" to that of "flock," because, due to the metaphor, it might otherwise have appeared that the Gentiles were to be called into the institution of the Jews. There was to be a new institution, God's "one flock."

Not the least of the sure evidences of Jesus' supernatural wisdom appears in this prophecy of the "one flock," including Jews and Gentiles alike of every tribe and nation. This dream of a world-wide, universal fellowship of God's people was envisioned in the great prophecies of Isaiah, and glimpsed in the experience of Jonah; but Jesus here dogmatically stated it as if it had already been accomplished.