13 The Hebrew perfect verbal form with vav (ו) consecutive here carries the same characteristic force as the imperfect in the preceding verse. According to the psalmist, the one who studies and obeys God’s commands typically prospers.
14 Heb “channels of water.”
15 Heb “which.”
16 The Hebrew imperfect verbal forms in v. 3 draw attention to the typical nature of the actions/states they describe.
17 Heb “in its season.”
18 Or “fade”; “wither.” The author compares the godly individual to a tree that has a rich water supply (planted by flowing streams), develops a strong root system, and is filled with leaves and fruit. The simile suggests that the godly have a continual source of life which in turn produces stability and uninterrupted prosperity.
19 Heb “and all which he does prospers”; or “and all which he does he causes to prosper.” (The simile of the tree does not extend to this line.) It is not certain if the Hiphil verbal form (יַצְלִיחַ, yatsliakh) is intransitive-exhibitive (“prospers”) or causative (“causes to prosper”) here. If the verb is intransitive, then כֹּל (kol, “all, everything”) is the subject. If the verb is causative, then the godly individual or the Lord himself is the subject and כֹּל is the object. The wording is reminiscent of Josh 1:8, where the Lord tells Joshua: “This law scroll must not leave your lips! You must memorize it day and night so you can carefully obey all that is written in it. Then you will prosper (literally, “cause your way to prosper”) and be successful.”

In other versions

ESVEnglish Standard Version

He is like a tree

planted by streams of water

that yields its fruit in its season,

and its leaf does not wither.

In all that he does, he prospers.

NIVNew International Version (2011)

That person is like a tree planted by streams of water,

which yields its fruit in season

and whose leaf does not wither—

whatever they do prospers.

CSBChristian Standard Bible

He is like a tree planted beside flowing streams

that bears its fruit in its season,

and its leaf does not wither.

Whatever he does prospers.

NLTNew Living Translation

They are like trees planted along the riverbank,

bearing fruit each season.

Their leaves never wither,

and they prosper in all they do.

LEBThe Lexham English Bible

And so, he is like a tree planted by streams of water

that gives its fruit in its season;

its leaf also does not wither.

Therefore all that he does prospers.

KJV 1900King James Version

And he shall be like a tree planted by the rivers of water,

That bringeth forth his fruit in his season;

His leaf also shall not wither;

And whatsoever he doeth shall prosper.

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