30 Heb “[will be] on their head[s].” “Joy” may be likened here to a crown (cf. 2 Sam 1:10). The statement may also be an ironic twist on the idiom “earth/dust on the head” (cf. 2 Sam 1:2; 13:19; 15:32; Job 2:12), referring to a mourning practice.
31 Heb “overtake” (so ); “they will obtain.”
32 Heb “grief and groaning will flee.”

In other versions

And the ransomed of the Lord shall return

and come to Zion with singing;

everlasting joy shall be upon their heads;

they shall obtain gladness and joy,

and sorrow and sighing shall flee away.

Those the Lord has rescued will return.

They will enter Zion with singing;

everlasting joy will crown their heads.

Gladness and joy will overtake them,

and sorrow and sighing will flee away.

And the ransomed of the Lord will return

and come to Zion with singing,

crowned with unending joy.

Joy and gladness will overtake them,

and sorrow and sighing will flee.

Those who have been ransomed by the Lord will return.

They will enter Jerusalem singing,

crowned with everlasting joy.

Sorrow and mourning will disappear,

and they will be filled with joy and gladness.

So the redeemed ones of Yahweh shall return,

and they shall come to Zion with singing,

and everlasting joy shall be on their heads.

Joy and gladness shall appear;

sorrow and sighing shall flee away!

Therefore the redeemed of the Lord shall return,

And come with singing unto Zion;

And everlasting joy shall be upon their head:

They shall obtain gladness and joy;

And sorrow and mourning shall flee away.

Public Domain