Translation:

26. "That ye serve none but Allah: verily I do fear for you the Penalty of a Grievous Day."

Notes (Tafseer)

1517. Noah's mission was to a wicked world, plunged in sin. The mission had a double character, as in the mission of all Prophets of Allah: it had to warn men against evil and call them to repentance, and it had to give them the glad tidings of Allah's Grace in case they turned back to Allah: it was a Guidance and Mercy.