"Those who are constant in their prayer," meaning they remain constant in it, according to the interpretation of al-Hasan.
﴿الَّذِينَ هُمْ عَلَى صَلاتِهِمْ دَائِمُونَ﴾ يَدُومُونَ عَلَيْهَا فِي تَفْسِيرِ الْحَسَنِ
