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Three major matters that invalidate the fast are mentioned in the Qur’an. They are intercourse, eating, and drinking.
“So now have sexual relations with them and seek that which Allaah has ordained for you (offspring), and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night), then complete your sawm (fast) till the nightfall” [al-Baqarah 2:187]