It is impossible to be certain what the writer intended here. Possible meanings are 1) shave off certain parts of their beards or 2) cut or shave any part of their beards.
This word "name" is used to represent Yahweh's character. AT: "not disgrace God's reputation" or "not disgrace their God" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "bread" represents food in general. Yahweh does not actually eat these offerings. It is the sincerity of those offering the food that pleases God. (See: [[rc://en/ta/man/translate/figs-synecdoche]])
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