John Gill Commentary 1 Kings 8:45

"then hear thou in heaven their prayer and their supplication, and maintain their cause." — 1 Kings 8:45 (ASV)

Then hear thou in heaven their prayer and their supplication ,
&c.] For success:

and maintain their cause ;
do them justice, and avenge their injuries, as the Targum; let it appear that their cause is right, by giving them victory.