Read Surah Hud 11:61: "AND UNTO [the tribe of] Thamud [We sent] their brother Salih. He said: "O my people! Worship God [alone]: you have no de..." Full Arabic text, English translation, and image generator.
۞ وَإِلَىٰ ثَمُودَ أَخَاهُمْ صَالِحًا ۚ قَالَ يَا قَوْمِ اعْبُدُوا اللَّهَ مَا لَكُمْ مِنْ إِلَٰهٍ غَيْرُهُ ۖ هُوَ أَنْشَأَكُمْ مِنَ الْأَرْضِ وَاسْتَعْمَرَكُمْ فِيهَا فَاسْتَغْفِرُوهُ ثُمَّ تُوبُوا إِلَيْهِ ۚ إِنَّ رَبِّي قَرِيبٌ مُجِيبٌ
AND UNTO [the tribe of] Thamud [We sent] their brother Salih. He said: "O my people! Worship God [alone]: you have no deity other than Him. He brought you into being out of the earth, and made you thrive thereon. Ask Him, therefore, to forgive you your sins, and then turn towards Him in repentance-for, verily, my Sustainer is ever-near, responding [to the call of whoever calls unto Him]!"