Al-Waaqia • EN-AL-JALALAYN
﴿ وَكَانُوا۟ يُصِرُّونَ عَلَى ٱلْحِنثِ ٱلْعَظِيمِ ﴾
“and would persist in heinous sinning,”
and they used to persist in the great sin namely idolatry.