"And to 'Ad [We sent] their brother Hud" (Qur'an 11:50). He says: And We sent to 'Ad their brother Hud; their brother by lineage, not their brother in religion.
﴿وَإِلَى عَاد أَخَاهُم هودا﴾ يَقُولُ: وَأَرْسَلْنَا إِلَى عادٍ أَخَاهُمْ هُودًا، أَخُوهُمْ فِي النَّسَبِ، وَلَيْسَ بِأَخِيهِمْ فِي الدِّينِ.
