A sermon uses ammā baʿd after praise and ends with a fitting prayer. What functions do these perform?

Final Chapter: Excellence of Opening, Barāʿat al-Istihlāl, Transition and Conclusion

• A discourse divider and a fitting conclusion
• A palindrome and rad al-ʿajz
• ʿAqd and ḥall
• Foreshadowing and plagiarism