[But] he said, "I will take refuge on a mountain to protect me from the water." [Noah] said, "There is no protector today from the decree of Allāh, except for whom He gives mercy." And the waves came between them, and he was among the drowned.
Noah’s son said to him that he would take refuge on a high mountain so that the water could not reach him. Noah told his son that nothing would save anyone from Allah’s punishment of being drowned by the Flood, except those who Allah would save in His mercy. A wave came between Noah and his disbelieving son, and his son was drowned by the Flood because of his disbelief.