36 Heb “from bloodshed.” “Bloodshed” here stands by metonymy for the guilt which it produces.
37 Heb “my tongue will shout for joy your deliverance.” Another option is to take the prefixed verbal form as a jussive, “may my tongue shout for joy.” However, the pattern in vv. 12–15 appears to be prayer/request (see vv. 12, 14a, 15a) followed by promise/vow (see vv. 13, 14b, 15b).
38 Heb “open my lips.” The imperfect verbal form is used here to express the psalmist’s wish or request.
39 Heb “and my mouth will declare your praise.”

In other versions

Deliver me from bloodguiltiness, O God,

O God of my salvation,

and my tongue will sing aloud of your righteousness.

O Lord, open my lips,

and my mouth will declare your praise.

Deliver me from the guilt of bloodshed, O God,

you who are God my Savior,

and my tongue will sing of your righteousness.

Open my lips, Lord,

and my mouth will declare your praise.

Save me from the guilt of bloodshed, God—

God of my salvation—

and my tongue will sing of your righteousness.

Lord, open my lips,

and my mouth will declare your praise.

Forgive me for shedding blood, O God who saves;

then I will joyfully sing of your forgiveness.

Unseal my lips, O Lord,

that my mouth may praise you.

Deliver me from the guilt of bloodshed, O God,

the God of my salvation;

then my tongue will sing aloud of your righteousness.

O Lord, open my lips,

and my mouth will proclaim your praise.

Deliver me from bloodguiltiness, O God, thou God of my salvation:

And my tongue shall sing aloud of thy righteousness.

O Lord, open thou my lips;

And my mouth shall shew forth thy praise.

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