2 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
3:31And David said to Joab, and to all the people that were with him, Rend your clothes, and gird you with sackcloth, and mourn before Abner. And king David himself followed the bier.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.