2. The project they had to prevent this, v. 26-28. "Therefore, to secure an interest in the altar of God to those who shall come after us, and to prove their title to it, we said, Let us build an altar, to be a witness between us and you," that, having this copy of the altar in their custody, it might be produced as an evidence of their right to the privilege of the original. Every one that saw this altar, and observed that it was never used for sacrifice and offering, would enquire what was the meaning of it, and this answer would be given to that enquiry, that it was built by those separate tribes, in token of their communion with their brethren and their joint-interest with them in the altar of the Lord. Christ is the great altar that sanctifies every gift; the best evidence of our interest in him will be the pattern of his Spirit in our hearts, and our conformity to him. If we can produce this it will be a testimony for us that we have a part in the Lord, and an earnest of our perseverance in following him.