What is the ruling on a father promising not to pray in the mosque due to his fear for his son of being pursued by the police?

If there is harm to you in going out to pray in the mosque, then you are excused from missing the congregational prayer, and you must obey your father in this. Fear of creditors leading to imprisonment or constant pursuit, or similar forms of harm, are among the excuses that permit missing the congregational prayer. However, if there is no harm, then your father is not permitted to prevent you from going out for congregational prayer, because the Prophet, peace and blessings be upon him, said: "Obedience is only in what is right," and he said: "Listening and obeying are incumbent upon a Muslim in what he likes and dislikes, as long as he is not commanded to commit an act of disobedience. If he is commanded to commit an act of disobedience, then there is no listening and no obeying," and he also said: "There is no obedience to a creature in disobedience to the Creator." However, if he forbids you from going out to the congregational prayer at the mosque so that you may pray with him in congregation, then it is incumbent upon you to obey him. You should advise your father and be dutiful to him in matters other than what he commands that involve disobedience.