Psalms 18:30 KJV

As for God, his way is perfect: the word of the Lord is tried: he is a buckler to all those that trust in him.
Psalms 18:30, King James Version

In context

29 For by thee I have run through a troop; and by my God have I leaped over a wall.

30 As for God, his way is perfect: the word of the Lord is tried: he is a buckler to all those that trust in him.

31 For who is God save the Lord? or who is a rock save our God?

Deuteronomy 32:4 He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he.
Proverbs 30:5 Every word of God is pure: he is a shield unto them that put their trust in him.
2 Samuel 22:31 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.
Psalms 84:11 For the Lord God is a sun and shield: the Lord will give grace and glory: no good thing will he withhold from them that walk uprightly.
Psalms 12:6 The words of the Lord are pure words: as silver tried in a furnace of earth, purified seven times.