هود · Verse 26 / 123 · Page 224
ۖ أَن لَّا تَعْبُدُوا إِلَّا اللَّهَ إِنِّي أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ أَلِيمٍ
Al laa ta'budooo illal laaha inneee akhaafu 'alaikum 'azaaba Yawmin aleem
That you not worship except Allah. Indeed, I fear for you the punishment of a painful day."
Noah called his people to worship Allah alone, and not to worship any besides Him, because he feared the punishment of a painful day for them.
Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.
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