Psalm 12:6; Psalm 17:3; Psalm 18:30; Psalm 26:2; Psalm 66:10; Psalm 105:19; Psalm 119:140

6 And the words of the LORD are flawless, like silver refined in a furnace of clay, purified seven times.
3 Though you probe my heart and examine me at night, though you test me, you will find nothing; I have resolved that my mouth will not sin.
30 As for God, his way is perfect; the word of the LORD is flawless. He is a shield for all who take refuge in him.
2 Test me, O LORD, and try me, examine my heart and my mind;
10 For you, O God, tested us; you refined us like silver.
19 till what he foretold came to pass, till the word of the LORD proved him true.
140 Your promises have been thoroughly tested, and your servant loves them.