כִּ֡י כַּאֲשֶׁ֣ר יֵרֵד֩ הַגֶּ֨שֶׁם וְהַשֶּׁ֜לֶג מִן־הַשָּׁמַ֗יִם וְשָׁ֙מָּה֙ לֹ֣א יָשׁ֔וּב כִּ֚י אִם־הִרְוָ֣ה אֶת־הָאָ֔רֶץ וְהוֹלִידָ֖הּ וְהִצְמִיחָ֑הּ וְנָ֤תַן זֶ֙רַע֙ לַזֹּרֵ֔עַ וְלֶ֖חֶם לָאֹכֵֽל׃
Ибо, как идет дождь, и снег с неба, и не возвращается туда, кроме как, поливая землю, и заставляя ее приносить и почивать, и давать семя сеятелю, так и хлеб едоку;
Tze'enah Ure'enah
“As the rain and the snow come down from heaven, etc.” [55:10]. The Holy One said: just like My rain and snow come from heaven on the earth and they do not go empty. They cause grain to grow on the earth to provide sufficient bread for the people. So too are My words that I have let you know through the prophets. They will be good for you, if you will be pious and fulfill the commandments that the prophet tells you.
Tze'enah Ure'enah
The Midrash writes: The Holy One said: It is inaccurate to compare My deeds to those of people. When a person does something evil to his friend and he admits the transgression, then he is killed. However, I God, whoever admits his transgression to Me, I forgive that person and whoever wants to deny it, then I punish him and do not forgive him.2Midrash Tanhuma, ed. S. Buber, Vayeshev, 11; Yalkut Shimoni, Isaiah, Remez 482.
Rashi
For, just as the rain and the snow fall and do not return empty, but do good for you.