The call to Taqwa (God-consciousness)

فَأَرْسَلْنَا فِيهِمْ رَسُولًا مِّنْهُمْ أَنِ ٱعْبُدُوا۟ ٱللَّهَ مَا لَكُم مِّنْ إِلَـٰهٍ غَيْرُهُۥٓ ۖ أَفَلَا تَتَّقُونَ

And We sent among them a messenger from themselves, [saying], "Worship Allāh; you have no deity other than Him; then will you not fear Him?"

إِذْ قَالَ لَهُمْ أَخُوهُمْ صَـٰلِحٌ أَلَا تَتَّقُونَ

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