15 The words “they say” are supplied in the translation for clarification and for stylistic reasons. The psalmist here quotes the sarcastic taunts of his enemies.
16 Heb “roll [yourself].” The Hebrew verb גלל here has the sense of “commit” (see Prov 16:3). The imperatival form in the Hebrew text indicates the enemies here address the psalmist. Since they refer to him in the third person in the rest of the verse, some prefer to emend the verb to a perfect, “he commits himself to the Lord.”
17 Heb “Let him”; the referent (the Lord) has been specified in the translation for clarity.
18 Heb “Let him”; the referent (the Lord) has been specified in the translation for clarity.
19 That is, “for he [the Lord] delights in him [the psalmist].” For other cases where the expression “delight in” refers to God’s delight in a person, see Num 14:8; 1 Kgs 10:9; Pss 18:19; 40:8. This statement does not necessarily reflect the enemies’ actual belief, but it does reflect the psalmist’s confession. The psalmist’s enemies sarcastically appeal to God to help him, because he claims to be an object of divine favor. However, they probably doubted the reality of his claim.
20 Or “the one who pulled me.” The verb is derived from either גָחָה (gakhah; see גחה) or גִּיחַ (giyakh; see 161 גִּיחַ) and seems to carry the nuance “burst forth” or “pull out.”

In other versions

“He trusts in the Lord; let him deliver him;

let him rescue him, for he delights in him!”

Yet you are he who took me from the womb;

you made me trust you at my mother’s breasts.

“He trusts in the Lord,” they say,

“let the Lord rescue him.

Let him deliver him,

since he delights in him.”

Yet you brought me out of the womb;

you made me trust in you, even at my mother’s breast.

“He relies on the Lord;

let him save him;

let the Lord rescue him,

since he takes pleasure in him.”

It was you who brought me out of the womb,

making me secure at my mother’s breast.

“Is this the one who relies on the Lord?

Then let the Lord save him!

If the Lord loves him so much,

let the Lord rescue him!”

Yet you brought me safely from my mother’s womb

and led me to trust you at my mother’s breast.

“He trusts Yahweh. Let him rescue him.

Let him deliver him because he delights in him.”

Yet you took me from the belly;

you made me trust while on my mother’s breasts.

He trusted on the Lord that he would deliver him:

Let him deliver him, seeing he delighted in him.

But thou art he that took me out of the womb:

Thou didst make me hope when I was upon my mother’s breasts.

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