Nobility of a person depends on deeds and moral qualities and not on family or status
قَالُوا أَنُؤْمِنُ لَكَ وَاتَّبَعَكَ الْأَرْذَلُونَ ﴿111﴾ قَالَ وَمَا عِلْمِي بِمَا كَانُوا يَعْمَلُونَ ﴿112﴾
They said, "Shall we believe in you while you are followed by the lowest people?" [ 111] He said, "I do not know about what they do. (26:111-112)
It is related in this verse that the disbelievers rejected the invitation of Sayyidna Nuh (علیہ السلام) to accept the faith on the plea that his followers were worthless poor people. So, how could they, the elite and noble, mix up with them? On this Nuh (علیہ السلام) replied that he did not know about their acts, thereby hinting that their understanding of nobility on the basis of family background, wealth, or status was wrong, and that the nobility or meanness and honour or disgrace is dependent on one's deeds and morals. Hence, it was their ignorance to put the label of sordidness on his followers, because they did not know about their deeds and disposition. Unless one knows fully well about the morals and deeds of others, it is not right to pass any judgment about them. (Qurtubi).