Behold, You desire truth in the innermost being,
And in the hidden part [of my heart] You will make me know wisdom.
Purify me with [a]hyssop, and I will be clean;
Wash me, and I will be whiter than snow.
Make me hear joy and gladness and be satisfied;
Let the bones which You have broken rejoice.
- Psalm 51:7 This evidently was a bristly plant which was useful as a kind of brush.