Isaiah 1:16-18 New Revised Standard Version (NRSV)
16 Wash yourselves; make yourselves clean;
remove the evil of your doings
from before my eyes;
cease to do evil,
17 learn to do good;
rescue the oppressed,
defend the orphan,
plead for the widow.
18 Come now, let us argue it out,
says the Lord:
though your sins are like scarlet,
they shall be like snow;
though they are red like crimson,
they shall become like wool.