The Proof that the `Asr Prayer is the Middle Prayer

Imam Ahmad reported that `Ali narrated that Allah's Messenger ﷺ said during the battle of Al-Ahzab (the Confederates):

«شَغَلُونَا عَنِ الصَّلَاةِ الْوُسْطَى، صَلَاةِ الْعَصْرِ، مَلَأَ اللهُ قُلُوبَهُم وَبُيُوتَهم نَارًا»

(They (the disbelievers) busied us from performing the Middle prayer, the `Ar prayer, may Allah fill their hearts and houses with fire.)