وَلَا يَنفَعُكُمۡ نُصۡحِيٓ إِنۡ أَرَدتُّ أَنۡ أَنصَحَ لَكُمۡ إِن كَانَ ٱللَّهُ يُرِيدُ أَن يُغۡوِيَكُمۡۚ هُوَ رَبُّكُمۡ وَإِلَيۡهِ تُرۡجَعُونَ ٣٤
And my advice will not benefit you - although I wished to advise you - if Allāh should intend to put you in error. He is your Lord, and to Him you will be returned."
Translation: Saheeh International (English)
Each word's meaning and sound
Noah told them that his advice and counsel would not benefit them if Allah willed that they be led astray from the right path, and if He willed to leave them without guidance because of their stubbornness. He was their Lord and it was He Who had control over their lives, so He would lead them astray if He willed; and to Him alone they would be returned on the Day of Judgement, when they would be repaid for their actions.
Al-Mukhtasar in interpreting the Noble Quran