What is the ruling on the prayer of one who prayed before its time, then heard its Adhan?

Allah Almighty has set a time for each prayer, which cannot be advanced or delayed without a valid excuse, as He says: (Indeed, prayer has been decreed upon the believers at appointed times). The Prophet, peace and blessings be upon him, clarified the beginning and end times for each prayer. Therefore, whoever prays before its time enters, their prayer is not valid and they must repeat it after the time has entered. The consideration is the actual entry of the prayer time, not just the Adhan.