Malachi says God will be a swift witness against sorcerers, adulterers, and those who swear falsely Malachi 3:5. He also names those who oppress hired workers, widows, and fatherless children, and those who thrust aside the sojourner Malachi 3:5. The verse concludes that these actions show they do not fear the LORD Malachi 3:5.
In Malachi 3:5–6, Yahweh answers the desire for “judgment” by saying he will personally come close and testify quickly against specific wrongdoers. The list names both religious and social abuses: occult practices, sexual unfaithfulness, false oaths, and exploitation of workers and vulnerable people, including immigrants. This unit sits inside Malachi’s back-and-forth style where the people question God’s justice and God replies. Just before, the speaker has announced a coming “messenger” and a refining, purifying work that will affect worship and the community’s offerings (Malachi 3:1–4).
Malachi 3:5–6 presents Yahweh as personally involved in setting things right. He does not stay distant; he “comes near” to the community for judgment and acts as a “swift witness” against specific wrongs (explicit textual claims).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Malachi 3:5, then read the surrounding section so the answer stays connected to the passage's flow.
5I will come near to you to judgment; and I will be a swift witness against the sorcerers, and against the adulterers, and against the perjurers, and against those who oppress the hireling in his wages, the widow, and the fatherless, and who turn aside the sojourner [from his right], and don`t fear me, says Yahweh of Hosts.