(Noah) 71 : 2
قَالَ يَا قَوْمِ إِنِّي لَكُمْ نَذِيرٌ مُبِينٌ
He said: Oh my people! Indeed I am a manifest warner to you.
Just like all Messengers after Noah, Noah had also told his people that I am a manifest warner to you from the Lord. See explanation 2: 119; 39: 19; and 51: 50-51.