"And to 'Ad," meaning: And We sent to 'Ad, "their brother Hud," meaning their brother in lineage, but not their brother in religion.
﴿وَإِلَى عَاد﴾ أَيْ: وَأَرْسَلْنَا إِلَى عادٍ ﴿أَخَاهُمْ هُودًا﴾ أَخُوهُمْ فِي النَّسَبِ، وَلَيْسَ بأخيهم فِي الدّين.