6 Heb “[with] a lie.” The Hebrew noun שֶׁקֶר (sheqer, “lie”) is used here as an adverb, “falsely, wrongfully” (see Pss 35:19; 38:19).
7 The Hebrew verb עָצַם (’atsam) can sometimes mean “are strong,” but here it probably focuses on numerical superiority; note the parallel verb רָבַב (ravav, “be many”).
8 Heb “that which I did not steal, then I restore.” Apparently אָז (’az, “then”) is used here to emphasize the verb that follows. They make me repay what I did not steal. The psalmist’s enemies falsely accuse him and hold him accountable for alleged crimes he did not even commit.

In other versions

More in number than the hairs of my head

are those who hate me without cause;

mighty are those who would destroy me,

those who attack me with lies.

What I did not steal

must I now restore?

Those who hate me without reason

outnumber the hairs of my head;

many are my enemies without cause,

those who seek to destroy me.

I am forced to restore

what I did not steal.

Those who hate me without cause

are more numerous than the hairs of my head;

my deceitful enemies, who would destroy me,

are powerful.

Though I did not steal, I must repay.

Those who hate me without cause

outnumber the hairs on my head.

Many enemies try to destroy me with lies,

demanding that I give back what I didn’t steal.

More numerous than the hairs of my head

are those hating me without a cause.

Those who are destroying me—my enemies wrongfully— are mighty.

What I did not steal, I then must restore.

They that hate me without a cause are more than the hairs of mine head:

They that would destroy me, being mine enemies wrongfully, are mighty:

Then I restored that which I took not away.

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