הַֽמְכַסֶּ֬ה שָׁמַ֨יִם ׀ בְּעָבִ֗ים הַמֵּכִ֣ין לָאָ֣רֶץ מָטָ֑ר הַמַּצְמִ֖יחַ הָרִ֣ים חָצִֽיר׃
Who covereth the heaven with clouds, Who prepareth rain for the earth, Who maketh the mountains to spring with grass.
Read midrashic interpretation of Psalms 147:8: and classical rabbinic exegesis.