2 Samuel 3:33-37

And the king sang a song of mourning for Abner and said, “Should Abner die as a fool dies?

“Your hands were not bound, nor your feet put in bronze shackles; As one falls before the wicked, you have fallen.” And all the people wept over him again.

Then all the people came to provide food for David in his distress while it was still day; but David vowed, saying, “May God do so to me, and more so, if I taste bread or anything else before the sun goes down.”

Now all the people took note of David’s vow, and it pleased them, just as everything that the king did pleased all the people.

So all the people and all Israel understood on that day that it had not been the desire of the king to put Abner the son of Ner to death.