19 Heb “the fear of the Lord I will teach you.” In vv. 13–14 the psalmist explains to his audience what it means to “fear” the Lord.
20 Heb “Who is the man who desires life?” The rhetorical question is used to grab the audience’s attention. “Life” probably refers here to quality of life, not just physical existence or even duration of life. See the following line.
21 Heb “[Who] loves days to see good?”
22 Heb “guard your tongue from evil.”
23 Heb “and your lips from speaking deception.”

In other versions

Come, O children, listen to me;

I will teach you the fear of the Lord.

What man is there who desires life

and loves many days, that he may see good?

Keep your tongue from evil

and your lips from speaking deceit.

Come, my children, listen to me;

I will teach you the fear of the Lord.

Whoever of you loves life

and desires to see many good days,

keep your tongue from evil

and your lips from telling lies.

Come, children, listen to me;

I will teach you the fear of the Lord.

Who is someone who desires life,

loving a long life to enjoy what is good?

Keep your tongue from evil

and your lips from deceitful speech.

Come, my children, and listen to me,

and I will teach you to fear the Lord.

Does anyone want to live a life

that is long and prosperous?

Then keep your tongue from speaking evil

and your lips from telling lies!

Come, you children, listen to me;

I will teach you the fear of Yahweh.

Who is the man who desires life,

who loves many days in order to see good?

Keep your tongue from evil

and your lips from speaking deceit.

Come, ye children, hearken unto me:

I will teach you the fear of the Lord.

What man is he that desireth life,

And loveth many days, that he may see good?

Keep thy tongue from evil,

And thy lips from speaking guile.

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