It seems like a dangerous thing to rob God, but that is what the people were doing. Malachi rebukes the people for their disrespect toward God. They were stingy and disobedient.
God was not happy.
This passage looks at the importance of giving generously. It is also the only passage in the Bible where we are told to test God. Check out the Bible study on Malachi 3 for important modern-day applications in the way we steward our finances.
Malachi 3 - Bible study companions questions available on our website - https://studyandobey.com/inductive-bible-study/malachi-studies/malachi3-1-5/
Malachi E-book - https://studyandobey.com/product/malachi-bible-study-guide/
Study and Obey Podcast - https://podcasts.apple.com/us/podcast/study-and-obey/id1571266150
800+ practical and free Bible studies - https://studyandobey.com
25+ Bible study guide e-books for individual or group study - https://studyandobey.com/shop/