פירוש על דברי הימים א 21:30

But David could not Then, when that incident occurred that the Holy One, blessed be He, commanded him to offer up a sacrifice, David could not go before it to inquire of God, i.e., before the altar that was in Gibeon.

because he was frightened by the sword of the angel of the Lord and David went according to the words of the Lord and built an altar, and the Lord answered him.