In some surahs a series of verses ends in the same prominent consonant or a closely related sound. That recurrence connects the verses acoustically even as their ideas develop from one stage to the next.
Al-Shuʿarāʾ, al-Qamar, al-Raḥmān, and al-Mursalāt display different forms of recurring endings and verbal repetition. Their effects depend on context: warning, reminder, or emphatic questioning may be foregrounded.
Remember: sound similarity alone is not the whole point. A recurring phrase can carry a renewed force because it comes after different material.