Surah Al Mu'minun Tafseer

فَأَوْحَيْنَا إِلَيْهِ أَنِ اصْنَعِ الْفُلْكَ بِأَعْيُنِنَا وَوَحْيِنَا فَإِذَا جَاء أَمْرُنَا وَفَارَ التَّنُّورُ فَاسْلُكْ فِيهَا مِن كُلٍّ زَوْجَيْنِ اثْنَيْنِ وَأَهْلَكَ

So, We revealed to him:"Construct the ship under Our Eyes and under Our revelation. Then, when Our command comes, and (water) gushes forth from the oven, take on board of each kind two, and your family,

At that point, Allah commanded him to build a boat and to make it strong and firm, and to carry therein of every kind two, i.e., a male and a female of every species of animals, plants and fruits etc. He was also to carry his family,

إِلاَّ مَن سَبَقَ عَلَيْهِ الْقَوْلُ مِنْهُمْ

except those thereof against whom the Word has already gone forth.

meaning, those whom Allah had already decreed were to be destroyed. These were the members of his family who did not believe in him, such as his son and his wife.

And Allah knows best.

وَلَا تُخَاطِبْنِي فِي الَّذِينَ ظَلَمُوا إِنَّهُم مُّغْرَقُونَ

And address Me not in favor of those who have done wrong. Verily, they are to be drowned.

means, `when you witness the heavy rain falling, do not let yourself be overcome with compassion and pity for your people, or hope for more time for them so that they may believe, for I have decreed that they will be drowned and will die in their state of disbelief and wrongdoing.'

The story has already been told in detail in Surah Hud, and there is no need to repeat it here