Musar к Йешайау 1:3

“You shall not profane My holy name” (Leviticus 22:32). This is among [the sins for which] one is liable for excision, as will be explained. And know that, is not the (greatest) damage and destruction found among the souls of the masses on the lips of the tongue? For they mention [God’s] name for nothing, and they also mention it without reverence. And about this matter did our Rabbis explain (Leviticus Rabbah 27) that which it is written (Isaiah 1:3), “Israel did not know.” And they are also not exacting about the cleanliness of the place and cleanliness of [their] palms.