Shaikh Salih al-Fawzaan (may Allah preserve him) said:
“Raise your children upon the worship of Allah, upon preserving the prayer with the congregation by attending the masaajid, upon seeking knowledge, attending the lessons of knowledge in the masaajid, the lectures, and other than that in which there is benefit for them. This is in order to supplement their lessons and their material at school. Also the masaajid, O servants of Allah, are the most important schools and they are more important than the schools that are well-known. So the masaajid are the schools in reality in which the children are raised upon the obedience of Allah, the worship of Allah, upon obtaining beneficial knowledge and righteous role models. So preserve them in the masaajid. Do not waste them nor leave them sleeping, amusing themselves, and playing. Make them attend the masaajid with you in order to train them upon obedience, to have affinity for the masaajid, to show them their fellow Muslim brothers praying in rows behind one Imam, supplicating to Allah, remembering Allah, and reciting the Quran. So preserve your children“.
Faisal bin Abdul Qaadir bin Hassan