28 The plural of the term מִקְדָּשׁ (miqdash) probably refers to the temple precincts (see Ps 68:35; Jer 51:51).
29 Heb “I discerned their end.” At the temple the psalmist perhaps received an oracle of deliverance announcing his vindication and the demise of the wicked (see Ps 12) or heard songs of confidence (for example, Ps 11), wisdom psalms (for example, Pss 1, 37), and hymns (for example, Ps 112) that describe the eventual downfall of the proud and wealthy.
30 The use of the Hebrew term אַךְ (’akh, “surely”) here literarily counteracts its use in v. 13. The repetition draws attention to the contrast between the two statements, the first of which expresses the psalmist’s earlier despair and the second his newly discovered confidence.
31 Heb “cause them to fall.”
32 Heb “they come to an end, they are finished, from terrors.”

In other versions

until I went into the sanctuary of God;

then I discerned their end.

Truly you set them in slippery places;

you make them fall to ruin.

How they are destroyed in a moment,

swept away utterly by terrors!

till I entered the sanctuary of God;

then I understood their final destiny.

Surely you place them on slippery ground;

you cast them down to ruin.

How suddenly are they destroyed,

completely swept away by terrors!

until I entered God’s sanctuary.

Then I understood their destiny.

Indeed, you put them in slippery places;

you make them fall into ruin.

How suddenly they become a desolation!

They come to an end, swept away by terrors.

Then I went into your sanctuary, O God,

and I finally understood the destiny of the wicked.

Truly, you put them on a slippery path

and send them sliding over the cliff to destruction.

In an instant they are destroyed,

completely swept away by terrors.

until I went into the sanctuary of God.

Then I understood their fate.

Surely you set them on slippery places.

You cause them to fall onto ruin.

How they become a desolation in a moment!

They come to a complete end by terrors.

Until I went into the sanctuary of God;

Then understood I their end.

Surely thou didst set them in slippery places:

Thou castedst them down into destruction.

How are they brought into desolation, as in a moment!

They are utterly consumed with terrors.

Public Domain