John Lightfoot on John 10:7

[I am the door.] Pure Israelitism among the Jews was the fold, and the door, and all things. For if any one was of the seed of Israel, and the stock of Abraham, it was enough (themselves being the judges) for such a one to be made a sheep, admitted into the flock, and be fed and nourished to eternal life. But in Christ's flock the sheep had another original, introduction, and mark.