2 And David said, I will show kindness unto Hanun the son of Nahash, because his father showed kindness to me. So David sent messengers to comfort him concerning his father. And David's servants came into the land of the children of Ammon to Hanun, to comfort him.
Matthew Henry's Commentary on 1 Chronicles 19:2
The history is here repeated which we read 2 Samuel 10. The only safety of sinners consists in submitting to the Lord, seeking peace with him, and becoming his servants. Let us assist each other in a good cause; but let us fear lest, while made instruments of good to others, we should come short of salvation, through unbelief and sin.