20 times in the book of Malachi God refers to Himself as the “Lord of Heaven’s Armies.” I couldn’t help but notice that he does that three times alone in 
Malachi 3:10-12. This passage of course is the famous tithe challenge passage. There’s a huge difference between believing in God and trusting Him. God points to our giving in these verses as that which is a vivid illustration of the level of “trust” we have in Him and His promises. Look at these verses: “Bring all the tithes into the storehouse so there will be enough food in my Temple. If you do, says the LORD of Heaven’s Armies, I will open the windows of heaven for you. I will pour out a blessing so great you won’t have enough room to take it in! Try it! Put me to the test! Your crops will be abundant, for I will guard them from insects and disease. Your grapes will not fall from the vine before they are ripe, says the LORD of Heaven’s Armies. Then all nations will call you blessed, for your land will be such a delight, says the LORD of Heaven’s Armies.
The Lord of Heaven’s Armies says he will open “the windows of heaven” for you. Since He’s the great commander of all heaven’s resources, only He can make such a promise. The multitude of blessings promised in this passage are ours to be enjoyed. Malachi has explained in the first Chapter how we can “return” to Him. It begins with admitting we’re not “worth-shipping” the Lord of Heaven’s Armies as we should. If we confess that, and turn to Him, his ears are wide open. He tells us in 2 Chronicles 7:14, “if my people who are called by my name humble themselves, and pray and seek my face and turn from their wicked ways, then I will hear from heaven and will forgive their sin and heal their land.”
He is the God who holds all Heaven’s resources in the palm of His hand. We should be able to trust Him. If says it, you know it will come to pass. Paul writes this “Lord of Heaven’s Armies” as “the one who is able to do far above and beyond all we ask and hope…”
Chuck
“Because of his grace he declared us righteous and gave us confidence that we will inherit eternal life. This is a trustworthy saying, and I want you to insist on these teachings so that all who trust in God will devote themselves to doing good.” Titus 3:7-8