Is the father sinful for refusing to marry off his son, despite the son's need for marriage and his fear of falling into sin?

First: Adhere to filial piety, emphasizing the constant awareness of God and avoiding prohibitions.

Second: Fear God, lower the gaze, avoid listening to prohibited things, and stay away from bad company.

Third: Increase acts of obedience, such as fasting, reading the Quran, supplication, keeping good company, exercising, and sleeping early.

Fourth: It is obligatory for a father to marry off his son if the son is in need, especially if the father is wealthy.

"It is obligatory upon your father, since God has enriched him, to spend on you for food, drink, clothing, and housing. It is also obligatory upon him to marry you off if you are in need of marriage" (Ibn Uthaymeen).