The Prophet S: "Many Muslim Children will go to Hell because of their fathers…"
The Prophet S said, “All of you are like shepherds of flocks. As a shepherd protects his flock, so you should protect those under your command from Hell! You should teach them Islam! If you don’t, you will be held responsible.”
And he S said, “Many Muslim children will go to the Hell named Wayl because of their fathers, for their fathers, being seized by the ambition of earning money and making merry and running after worldly affairs only, did not teach their children Islam and the Quran. I am far removed from such fathers. And they are away from me. Those who do not teach their children their religion will go to Hell.”
Allah declares,“Protect yourselves and those in your homes and under your command from the fire!” (Surah Tahrim, Ayat 6)
It is more important for a father to protect his children against the fire of Hell than against worldly fire. And protecting them against the fire of Hell is to teach them iman, the fard and haram to accustom them to worshipping, and to protect them against irreligious and immoral friends. The source of all kinds of immoral deeds is an evil friend.
Source: Endless Bliss