Muslims fast during the month of Ramadan because it is a fundamental pillar of Islam and a direct command from Allah. The primary and foremost reason for fasting is to obey God and worship Him by abstaining from food, drink, and marital relations from dawn until sunset. This act of devotion is explicitly commanded in the Qur'an.

Shaykh Ibn ‘Uthaymeen explains that the ultimate purpose of the fast is to attain taqwa (God-consciousness, piety). This is stated in the verse: "O you who have believed, decreed upon you is fasting as it was decreed upon those before you that you may attain taqwa" ([Surah al-Baqarah 2:183](/quran/2/183)). By giving up permissible things for the sake of Allah, a person trains their soul to abandon the impermissible (sins). Because only Allah knows whether a person is truly fasting, this act of worship nurtures sincerity and the awareness that God is always watching.

Beyond this core purpose, scholars like Ibn 'Uthaymeen mention other wisdoms and benefits. Fasting allows a person to appreciate the blessings of Allah, as the temporary experience of hunger and thirst makes one more grateful for food and drink. It also cultivates compassion and empathy for the poor who experience hunger regularly, which in turn encourages charity. Furthermore, fasting is a powerful means of developing self-discipline, patience, and control over one's desires. It is a spiritual training that strengthens the believer's resolve and character, helping them to control their tongue, gaze, and limbs from engaging in sinful acts. While there are recognized health benefits to fasting, these are secondary to the primary spiritual goals of obedience and attaining taqwa.