Dalil
العربية

Quran Al-Baqarah 2:238

حَٰفِظُواْ عَلَى ٱلصَّلَوَٰتِ وَٱلصَّلَوٰةِ ٱلۡوُسۡطَىٰ وَقُومُواْ لِلَّهِ قَٰنِتِينَ

Translation

Maintain with care the [obligatory] prayers and [in particular] the middle [i.e., ʿaṣr] prayer and stand before Allāh, devoutly obedient.