Psalm 1:3 (BSB)

He is like a tree planted by streams of water, yielding its fruit in season, whose leaf does not wither, and who prospers in all he does.

From Psalms 1. Also in the ESV.

Commentary on Psalm 1:3

• John Calvin (Reformed), Calvin's Commentaries on Psalm 1:1-6: Commentary upon the book of Psalms PSALM 1. He who collected the Psalms into one volume, whether Ezra or some other person, appears to have placed this Psalm at the beginning, by way of preface, in which he inculcates upon all the godly the duty of meditating upon the law of God.
• C.H. Spurgeon (Reformed Baptist), The Treasury of David on Psalm 1:3: And he shall be like a tree planted—not a wild tree, but "a tree planted, " chosen, considered as property, cultivated and secured from the last terrible uprooting, for "every plant which my heavenly Father hath not planted, shall be rooted up:" Matthew 15:13. "By the rivers of water;" so that even if one river should fail, he hath another.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Psalm 1:1-3: The psalmist begins with the character and condition of a godly man, that those may first take the comfort of that to whom it belongs. Here is, I. A description of the godly man's spirit and way, by which we are to try ourselves.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Psalm 1:3: And he shall be like a tree planted by the rivers of water,.... Or, "for then shall he be", &c. as Alshech renders the words; and the Hebrew "vau" is often used for "then" (q). As Psa 1:1 describe the man who is blessed, this points at his blessedness, and shows and proves him to be an happy man; for he is comparable to a...