Al-Ma'aarij • BN-TAFSEER-IBN-E-KASEER
﴿ وَٱلَّذِينَ هُمْ عَلَىٰ صَلَاتِهِمْ يُحَافِظُونَ ﴾
“and who guard their prayers [from all worldly intent].”
Please check ayah 70:35 for complete tafsir.