مَا كَانَ مُحَمَّدٌ أَبَا أَحَدٍ مِنْ رِجَالِكُمْ وَلَكِنْ رَسُولَ اللَّهِ وَخَاتَمَ النَّبِيِّينَ
Muhammad ﷺ is not the father of any of your men, but is Allah’s Messenger and the Seal of the Prophets. (Al-Aḥzāb 33:40)
The phrase Khātam al-Nabiyyīn affirms his status as Messenger and the finality of prophethood together. No further prophetic office begins after him.