Mouth
In most cases, "mouth" in the Bible represents thought and logic, especially the kind of active, concrete thought that is connected with speech. The reason for this is pretty obvious, but it also holds when people, for instance, remove a stone from the mouth of a well, which represents gaining access to spiritual ideas. The mouth is used for eating as well as speaking, of course. In those circumstances, it represents our first, most external perception of a new spiritual idea or desire. This also makes sense, mirroring the way tasting food in the mouth gives us an instant impression of the quality of the food.
Ezechiel 45:22-24
22
Et faciet princeps in die illa, pro se et pro universo populo terræ, vitulum pro peccato.
23
Et in septem dierum solemnitate faciet holocaustum Domino septem vitulos, et septem arietes immaculatos, quotidie septem diebus : et pro peccato hircum caprarum quotidie.
24
Et sacrificium ephi per vitulum, et ephi per arietem faciet, et olei hin per singula ephi.