What is the antecedent of -hā in la-tarawunnahā?

Supplementary Practice 19: Comparative Rhetorical Analysis of Sūrat al-ʿAṣr and al-Takāthur

• Al-jaḥīm, the Fire
• An unexpressed al-ʿilm
• Al-maqābir as a feminine plural
• Al-takāthur