1 John 3:3

3 All who have this hope in him purify themselves, just as he is pure.

Read 1 John 3:3 Using Other Translations

And every man that hath this hope in him purifieth himself, even as he is pure.
And everyone who thus hopes in him purifies himself as he is pure.
And all who have this eager expectation will keep themselves pure, just as he is pure.