III. They shall set up the public worship of God in their land (v. 19): There shall be an altar to the Lord in the midst of the land of Egypt, an altar on which they shall do sacrifice and oblation (v. 21); therefore it must be understood spiritually. Christ, the great altar, who sanctifies every gift, shall be owned there, and the gospel sacrifices of prayer and praise shall be offered up; for by the law of Moses there was to be no altar for sacrifice but that at Jerusalem. In Christ Jesus all distinction of nations is taken away; and a spiritual altar, a gospel church, in the midst of the land of Egypt, is as acceptable to God as one in the midst of the land of Israel; and spiritual sacrifices of faith and love, and a contrite heart, please the Lord better than an ox or bullock.