And the angel of the Lord destroying ... - These words are not in Samuel, which puts the third alternative briefly. They prepare the way for the angelic appearance 1 Chronicles 21:16, on which the author is about to lay so much stress.
Related Commentaries of 1 Chronicles 21:12
1 Chronicles 21:12
12 Either three years' famine; or three months to be destroyed before thy foes, while that the sword of thine enemies overtaketh thee; or else three days the sword of the LORD, even the pestilence, in the land, and the angel of the LORD destroying throughout all the coasts of Israel. Now therefore advise thyself what word I shall bring again to him that sent me.