17 Heb “The Lord [is] my strength and my shield.”
18 Heb “in him my heart trusts.”
19 Or “I am helped.”
20 Heb “and my heart exults.”
21 Heb “and from my song I will thank him.” As pointed in the Hebrew text, מִשִּׁירִי (mishiri) appears to be “from my song,” but the preposition “from” never occurs elsewhere with the verb “to thank” (Hiphil of יָדָה, yadah). Perhaps משׁיר is a noun form meaning “song.” If so, it can be taken as an adverbial accusative, “and [with] my song I will thank him.” See P. C. Craigie, Psalms 1–50 (), .
22 Heb “the Lord [is] strength to them” (or perhaps, “to him”). The form לָמוֹ (lamo, “to them/him”) is probably a corruption of an original לְעַמוֹ (lé’amo, “to his people”; see P. C. Craigie, Psalms 1–50 [], ), perhaps due to quiescence of the letter ayin (ע; see P. McCarter, Textual Criticism [], 55). Note the reference to the Lord’s “people” in the next verse.
23 Heb “he [is] a refuge of help for his anointed one.” The noun מָשִׁיחַ (mashiakh, “anointed one”) refers to the Davidic king, who perhaps speaks as representative of the nation in this psalm. See Pss 2:2; 18:50; 20:6; 84:9; 89:38, 51; 132:10, 17.

In other versions

The Lord is my strength and my shield;

in him my heart trusts, and I am helped;

my heart exults,

and with my song I give thanks to him.

The Lord is the strength of his people;

he is the saving refuge of his anointed.

The Lord is my strength and my shield;

my heart trusts in him, and he helps me.

My heart leaps for joy,

and with my song I praise him.

The Lord is the strength of his people,

a fortress of salvation for his anointed one.

The Lord is my strength and my shield;

my heart trusts in him, and I am helped.

Therefore my heart celebrates,

and I give thanks to him with my song.

The Lord is the strength of his people;

he is a stronghold of salvation for his anointed.

The Lord is my strength and shield.

I trust him with all my heart.

He helps me, and my heart is filled with joy.

I burst out in songs of thanksgiving.

The Lord gives his people strength.

He is a safe fortress for his anointed king.

Yahweh is my strength and my shield.

My heart trusts him and I am helped.

So my heart rejoices,

and with my song I will give thanks to him.

Yahweh is their strength,

and he is the refuge for the salvation of his anointed one.

The Lord is my strength and my shield;

My heart trusted in him, and I am helped:

Therefore my heart greatly rejoiceth;

And with my song will I praise him.

The Lord is their strength,

And he is the saving strength of his anointed.

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