The ruling on holding a competition for reading a book or listening to a religious tape

Question:
He says: Honorable Shaykh, may Allah grant you success, what is the ruling on holding a competition for a book or a religious tape that is listened to, followed by questions written on it, where the one who answers receives a prize?

Answer:
This falls under what Ibn al-Qayyim said: anything that is part of Islamic knowledge, or that encourages Islamic knowledge, it is permissible to take a prize for it; because it falls under jihad in the path of Allah.