What principle emerges when comparing fal-yaʿbudū and fa-waylun?

Supplementary Practice 21: Comparative Rhetorical Study of Sūrat Quraysh and al-Māʿūn

• A shared connective letter does not guarantee identical rhetorical function
• Make both fāʾs the same overt causal particle in every respect
• Treat fa-waylun as a lām-command imperfect verb
• Treat fal-yaʿbudū as an unconditional nominal warning