2 Samuel 22:31 in the King James Version
As for God, his way is perfect; the word of the LORD is tried: he is a buckler to all them that trust in him.
Context
30 For by you, I run against a troop. By my God, I leap over a wall.
31 As for God, his way is perfect. The LORD’s word is tested. He is a shield to all those who take refuge in him.
32 For who is God, besides the LORD? Who is a rock, besides our God?