Prophethood and Da'wah

أَن لَّا تَعْبُدُوٓا۟ إِلَّا ٱللَّهَ ۖ إِنِّىٓ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ أَلِيمٍ

That you not worship except Allāh. Indeed, I fear for you the punishment of a painful day."

إِذْ قَالَ لَهُمْ أَخُوهُمْ هُودٌ أَلَا تَتَّقُونَ

When their brother Hūd said to them, "Will you not fear Allāh?