This refers to the people of Israel who are slaves of the Babylonians. This phrase describes how they work. Alternate translation: "The slave" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Here "bread" represents food in general. This can be written in positive form. Alternate translation: "nor will he be without food" (See: [[rc://en/ta/man/jit/figs-synecdoche]])