God said in Malachi 3:10 that He would open the windows of blessing for us. Explain how I can get God to open the window of blessing for me.
Today many false teachers have taught that God's word teaches that believers should expect great material and financial blessing, and these false teachers often turn to passages like Malachi 3 to support their twisted claims. While it is true that God is loving and caring for His children, it is NOT true that He promises to bring great riches and an abundance of material blessings to believers.
Regarding Malachi 3:10, the Lord was speaking specifically to the nation of Israel in this verse concerning their sin under the Old Covenant. The Old Covenant was given to Israel through Moses, and the Law required Israel to contribute tithes to the temple in support of the Levitical priests. In Malachi's day, the nation of Israel had forsaken the covenant and was no longer tithing as required by their Law.
Consequently, the Lord told the nation they must bring the missing tithes to the temple or else the Lord will bring curses against Israel. The says:
God offered to bless the nation for their obedience to the covenant, but if they did not obey the covenant, they would be cursed instead. If someone teaches that God intends to bless Gentiles with great material rewards on the same basis, then why don't they also teach that Gentiles will receive the curses for failing to keep the Law? In reality, both claims are false: believers are not promised the blessing nor the curses of the Old Covenant.
Today as Christians, we are not bound by the Old Covenant nor are we commanded to follow the Law:
Israel is bound by their covenant, and the tithe is a specific requirement in the Bible for Israel to observe in support of the Jewish temple and the Levitical priests. There is no requirement for Christians to tithe, and since Christians are not bound by the Law of Moses, we have no requirement to give tithes. We are expected to support the work of the Lord as we are led by the Holy Spirit. You can read more about the true Biblical perspective on tithes the article "How much do I have to tithe?"
Generally, any teaching that focuses on prosperity and material "blessing" from God are false and should be avoided along with the men who deliver these false messages. We recommend you listen to the Sovereignty of God teaching series to learn more about this dangerous and unbiblical teaching