The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
circumcision
Circumcision is the "sign" of the Abrahamic Covenant (Gen 17:7-14); (Rom 4:11). "The reproach of Egypt" was that, during the later years of the Egyptian bondage, this separating sign had been neglected (Compare (Exo 4:24-26) and this neglect had continued during the wilderness wanderings. The New Testament analogue is world conformity; the failure openly to take a believer's place with Christ in death and resurrection. (Rom 6:2-11); (Gal 6:14-16). Spiritually it is mortifying the deeds of the body through the Spirit. (Rom 8:13); (Gal 5:16); (Gal 5:17); (Col 2:11); (Col 2:12); (Col 3:5-10).
corn
The manna is a type of Christ in humiliation, known "after the flesh," giving his flesh that the believer might have life (Joh 6:49-51) while the "old corn of the land" is Christ apprehended as risen, glorified, and seated in the heavenlies. Occupation with Christ on earth, "crucified through weakness," tends to a wilderness experience. An experience befitting the believer's place in the heavenlies demands an apprehension of the power of His resurrection; (Co2 5:16); (Co2 13:4); (Phi 3:10); (Eph 1:15-23). It is the contrast between "milk" and "meat" in Paul's writings. (Co1 3:1); (Co1 3:2); (Heb 5:12-14); (Heb 6:1-3).
holy
translated, "consecrated," (Jos 6:19) in R.V. "holy."