ש (Sin/Shin)
4:21 Rejoice and be glad for now, O people of Edom,
who reside in the land of Uz.
But the cup of judgment will pass to you also;
you will get drunk and take off your clothes.
ת (Tav)
4:22 O people of Zion, your punishment will come to an end;
he will not prolong your exile.
But, O people of Edom, he will punish your sin
and reveal your offenses!