Prayer is invalidated by eating and drinking during it; because they are contrary to the prayer, and there is no difference between intentional acts and forgetfulness, as both invalidate the prayer; because the state of prayer is one of remembrance; it is in a form that contradicts the norm due to the necessity of purity, entering into a state of ihram, humility, facing the Qibla, and transitioning from one state to another while refraining from speech, which is akin to breathing, and all of this occurs in a short time, making eating and drinking extremely inappropriate, thus no excuse is valid. Refer to: Tabyin al-Haqaiq 1: 159.