In the 29th lesson of Likutei MoHaRaN, Rebbe Nachman speaks of the importance of clean “garments.” On the one hand, he is referring specifically to one’s clothing, while on the other hand he is referring to one’s speech.
“This is the concept of white garments. In other words, speech…corresponds to white garments. For it is necessary to take care of one’s clothing; not to abuse the clothing, but to care for them properly so that no spot or stain gets on them.” --Likutey Moharan, p. 209
One of the first activities incumbent upon Jews as preparation for morning prayer and meals is the act of ritual hand washing. One of the more interesting features of this mitzvah is the language of the blessing one recites upon performance: