Proverbs 30:12

30:12 There is a generation who are pure in their own eyes

and yet are not washed from their filthiness.

Proverbs 15:26

15:26 The Lord abhors the plans of the wicked,

but pleasant words are pure.

Proverbs 22:11

22:11 The one who loves a pure heart

and whose speech is gracious – the king will be his friend.