פּירוש אויף מלאכי 3:10

“Bring the full tithe” [3:10]. Bring the tithes into My house so that My priests and levites should have enough food to do the service in the Temple. The Holy One said: test Me with tithes and giving charity, if I will not bless you with good rain. I will open My windows in heaven to bring blessings down to you, that you will say yourself that it is enough.

The Talmud says in the first chapter of [tractate] Ta’anit. Rabbi Johanan found a child going home from his teacher and he said to the child. What did you study with your teacher? The child said: I studied, “you shall set aside a tenth” [Deuteronomy, 14:22]. The child said to Rabbi Johanan: what is the meaning of this verse? Rabbi Johanan said: give the tithe in the hope that you will become rich. The child said: can we test the Holy One? It is written, “Do not try the Lord, your God” [Deuteronomy, 6:16]. You should not test the Holy One. Rabbi Johanan responded: it is written here, “bring the full tithe into the house, etc.” [3:10]. God said, test me. I will give you enough money and grain so that you will not have enough vessels into which to put the grain.³B. Ta’anit, 9a.

so that there may be nourishment in My House There shall be food accessible for My servants.