How does innahu kāna tawwāban relate to the preceding order?

Supplementary Practice 22: Comparative Rhetorical Study of Sūrat al-Kāfirūn and al-Naṣr

• It entirely negates istaghfirhu
• It gives a reassuring reason to seek forgiveness
• It identifies the opposing group's new religion
• It is a wholly unrelated historical statement