John Gill Commentary 2 Samuel 18:31

"And, behold, the Cushite came; and the Cushite said, Tidings for my lord the king; for Jehovah hath avenged thee this day of all them that rose up against thee." — 2 Samuel 18:31 (ASV)

And, behold, Cushi came
A little after:

and Cushi said, tidings, my lord the king ;
news is sent and brought by me, and good news it is:

for the Lord has avenged you this day of all them that rose up
against you ;
they are either killed or dispersed; there is an entire victory over them, and deliverance from them.