21:1-30 David's numbering the people. - No mention is made in this book of David's sin in the matter of Uriah, neither of the troubles that followed it: they had no needful connexion with the subjects here noted. But David's sin, in numbering the people, is related: in the atonement made for that sin, there was notice of the place on which the temple should be built. The command to David to build an altar, was a blessed token of reconciliation. God testified his acceptance of David's offerings on this altar. Thus Christ was made sin, and a curse for us; it pleased the Lord to bruise him, that through him, God might be to us, not a consuming Fire, but a reconciled God. It is good to continue attendance on those ordinances in which we have experienced the tokens of God's presence, and have found that he is with us of a truth. Here God graciously met me, therefore I will still expect to meet him.
26. David built there an altar—He went in procession with his leading men from the royal palace, down Mount Zion, and through the intervening city. Although he had plenty of space on his own property, he was commanded, under peremptory direction, to go a considerable distance from his home, up Mount Moriah, to erect an altar on premises which he had to buy. It was on or close to the spot where Abraham had offered up Isaac.
answered him by fire from heaven—(See Le 9:24; 1Ki 18:21-23; 2Ki 1:12; 2Ch 7:1).