Here the noun "word" can be translated with the verb "spoke." The word "mouth" represents Jeremiah. Alternate translation: "what Yahweh spoke through Jeremiah" or "the word from Yahweh that Jeremiah spoke" (See: [[rc://en/ta/man/jit/figs-synecdoche]])
The people were supposed to obey the Sabbath law by not farming the land every seventh year. This phrase speaks about this as if the land were a person that would obey the Sabbath law and rest. Alternate translation: "until the land had rested according to the Sabbath law" or "until, as required by the Sabbath law, no one had farmed the land" (See: [[rc://en/ta/man/jit/figs-personification]])
The word "it" refers to the land. The land is spoken of as if it were a person who observed the Sabbath. Alternate translation: "The requirements of the Sabbath law were fulfilled as long as the land lay desolate" (See: [[rc://en/ta/man/jit/figs-personification]])