18 Heb “in the roll of the scroll it is written concerning me.” Apparently the psalmist refers to the law of God (see v. 8), which contains the commandments God desires him to obey. If this is a distinctly royal psalm, then the psalmist/king may be referring specifically to the regulations of kingship prescribed in Deut 17:14–20. See P. C. Craigie, Psalms 1–50 (), .
19 Or “your will.”
20 Heb “your law [is] in the midst of my inner parts.” The “inner parts” are viewed here as the seat of the psalmist’s thought life and moral decision making.
21 The great assembly is also mentioned in Pss 22:25 and 35:18.
22 Heb “I proclaim justice in the great assembly.” Though “justice” appears without a pronoun here, the Lord’s just acts are in view (see v. 10). His “justice” (צֶדֶק, tsedeq) is here the deliverance that originates in his justice; he protects and vindicates the one whose cause is just.
23 Heb “Look! My lips I do not restrain.”
24 Heb “your justice I have not hidden in the midst of my heart.”
25 Heb “I have not hidden your loyal love and reliability.”

In other versions

ESVEnglish Standard Version

Then I said, “Behold, I have come;

in the scroll of the book it is written of me:

I delight to do your will, O my God;

your law is within my heart.”

I have told the glad news of deliverance

in the great congregation;

behold, I have not restrained my lips,

as you know, O Lord.

I have not hidden your deliverance within my heart;

I have spoken of your faithfulness and your salvation;

I have not concealed your steadfast love and your faithfulness

from the great congregation.

NIVNew International Version (2011)

Then I said, “Here I am, I have come—

it is written about me in the scroll.

I desire to do your will, my God;

your law is within my heart.”

I proclaim your saving acts in the great assembly;

I do not seal my lips, Lord,

as you know.

I do not hide your righteousness in my heart;

I speak of your faithfulness and your saving help.

I do not conceal your love and your faithfulness

from the great assembly.

CSBChristian Standard Bible

Then I said, “See, I have come;

in the scroll it is written about me.

I delight to do your will, my God,

and your instruction is deep within me.”

I proclaim righteousness in the great assembly;

see, I do not keep my mouth closed—

as you know, Lord.

I did not hide your righteousness in my heart;

I spoke about your faithfulness and salvation;

I did not conceal your constant love and truth

from the great assembly.

NLTNew Living Translation

Then I said, “Look, I have come.

As is written about me in the Scriptures:

I take joy in doing your will, my God,

for your instructions are written on my heart.”

I have told all your people about your justice.

I have not been afraid to speak out,

as you, O Lord, well know.

I have not kept the good news of your justice hidden in my heart;

I have talked about your faithfulness and saving power.

I have told everyone in the great assembly

of your unfailing love and faithfulness.

LEBThe Lexham English Bible

Then I said, “Look, I come.

In the scroll of the book

it is written concerning me:

‘I delight to do your will, O my God,

and your law is deep within me.’ ”

I have brought good tidings of righteousness in the great congregation.

Look, I have not shut my lips.

O Yahweh, you surely know that.

Your righteousness I have not hidden in the midst of my heart.

I have spoken of your faithfulness and your salvation.

I have not concealed your loyal love or your faithfulness

from the great congregation.

KJV 1900King James Version

Then said I, Lo, I come:

In the volume of the book it is written of me,

I delight to do thy will, O my God:

Yea, thy law is within my heart.

I have preached righteousness in the great congregation:

Lo, I have not refrained my lips,

O Lord, thou knowest.

I have not hid thy righteousness within my heart;

I have declared thy faithfulness and thy salvation:

I have not concealed thy lovingkindness and thy truth from the great congregation.

Public Domain