Where does the phrase "to return to the fold" originate?

A strong fenced enclosure for the protection of the sheep gathered within it (Num. 32:24; 1 Chr. 17:7; Ps. 50:9; 78:70). In John 10:16 the Authorized Version renders by "fold" two distinct Greek words, aule and poimne, the latter of which properly means a "flock," and is so rendered in the Revised Version. (See also Matt. 26:31; Luke 2:8; 1 Cor. 9:7.)