Below are links to PDF documents of two sermons of Thomas Manton on texts from Malachi chapter 3:
Malachi 3:7 A fast sermon on Returning to God
Malachi 3:17 God Sparing His Children
Both of these sermons can be found Manton’s Works, the first on pages 315-328 of volume 15, and the second on pages 337-347 of volume 18.
Links to previously uploaded material can be found at this page.