What does fāʾ do between remembrance and prayer in 87:15?

Supplementary Practice 28 — Comparative Rhetoric of Sūrat al-Aʿlā and Sūrat al-Ghāshiyah

• Fāʾ makes the noun definite
• Fāʾ merely combines items with no ordering
• Presents prayer as an ordered action following remembrance
• Fāʾ begins an unrelated topic