Malachi 4:1–6: The Day of Yahweh and Healing
Malachi 4 answers a people who doubted God's justice not with an argument but with a certain, discriminating day. It consumes the proud and dawns as healing for those who fear God's name, and it comes only after a messenger like Elijah turns hearts.
Joel 1 Meaning: Locusts, Mourning, and the Day of Yahweh
Joel 1 treats a ruinous locust plague and the halt of temple worship as God's word to his people, not random misfortune. The chapter answers the crisis not with explanation but with a summons to mourning, fasting, and prayer.