Ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, obligated payment of charity at the end of Ramadan, a portion of dates or barley, upon slave and freeman, male and female, young and old among the Muslims. The Prophet ordered it to be given before people go out for Eid prayer.

Source: Ṣaḥīḥ al-Bukhārī 1503, Ṣaḥīḥ Muslim 986