91:12

إِذِ انبَعَثَ أَشْقَاهَا

Transliteration:

Ithi inbaAAatha ashqaha

Word by Word:

When (was) sent forth (the) most wicked of them.

Translations:

when that most hapless wretch from among them rushed forward [to commit his evil deed],

Behold, the most wicked man among them was deputed (for impiety).

When the basest of them broke forth

When the basest of them broke forth with mischief --

When the most wretched of them was sent forth.