قُلْ يَا أَيُّهَا النَّاسُ إِنِّي رَسُولُ اللَّهِ إِلَيْكُمْ جَمِيعًا.
Say: O humanity, I am the Messenger of Allah to you all. (Al-Aʿrāf 7:158)
Yā ayyuhā al-nās addresses people generally, and ilaykum jamīʿan explicitly says the Messenger has been sent to them all.
No particular tribe, family or locality is singled out as the sole audience. The scope of his message includes the whole of humanity.