The following exegetical study presents the restoration of Judah and Jerusalem described in the passage Joel 4,18-21. Through a unitary conception from yôm YHWH s oracles on Joel s book, as a double effected judgment announcement, as well the general structure of the book as a national lament (cf. Joel 1,1–2,18) followed by the YHWH s answer (cf. Joel 2,19–4,21), it can be inferred that the restoration of Judah and Jerusalem is the expected result by the decisive judgment in yôm YHWH and consequence of the saviour presence of YHWH in the temple and his favourable reply to the Liturgy of Lament made by the community of the Judah sons. The literary unity Joel 4,18-21 is presented as a saviour oracle by the dual announcement: it describes the restoration of Judah and Jerusalem as an eschatological restoration of selected land and people. The passage Joel 4,18-21 answers the issues described on Joel s book through keywords: such as an agricultural disaster (cf. Joel 1,2–2,27) and a political failure (cf. Joel 3,1–4,17). Moreover, the formal structure of the passage reflects the two stages of YHWH s answer to both problems: the land s restoration (cf. Joel 2,18-27) and the people s restoration (cf. Joel 3,1–4,17). Thereby, it can be understood the diversity and complexity of themes in the passage Joel 4,18-21 and its conclusive function as it resumes, synthesizes and finalizes the main themes of Joel s book, furthermore, it raises the argumentation developed on the whole book.