John Gill Commentary 2 Samuel 24:12

"Go and speak unto David, Thus saith Jehovah, I offer thee three things: choose thee one of them, that I may do it unto thee." — 2 Samuel 24:12 (ASV)

Go, and say unto David
Not my servant David, as Nathan was bid to say to him when it was in his heart to build an house for him, (2 Samuel 7:5) ; but now he had sinned and displeased the Lord, and therefore it is only plain David:

thus saith the Lord, I offer thee three [things] ;
or lay them before thee to consider of which thou wouldest have done; the Targum is, ``one of three things I cast upon thee,'' as a burden to bear; one of the three I will certainly inflict upon thee by way of chastisement:

choose thee one of them, that I may [do it] unto thee ;
here is mercy mixed with judgment; the Lord is angry, yet shows great condescension and goodness; a sovereign Being, who could have imposed what punishment he pleased, and even all the three after mentioned, yet resolves but on one, and leaves that to the option of David.