Why does “wa-adhinat li-rabbihā wa-ḥuqqat” occur twice?

Supplementary Practice 29 — Comparative Rhetoric of Sūrat al-Infiṭār and Sūrat al-Inshiqāq

• An empty repetition without function
• Emphasis on the shared obedience of heaven and earth
• Adding two unidentified oaths
• Merely completing end-rhyme