Appears 4 times in the Quran.
22:19 هَٰذَانِ خَصْمَانِ ٱخْتَصَمُوا۟ فِى رَبِّهِمْ فَٱلَّذِينَ كَفَرُوا۟ قُطِّعَتْ لَهُمْ ثِيَابٌ مِّن نَّارٍ يُصَبُّ مِن فَوْقِ رُءُوسِهِمُ ٱلْحَمِيمُ
These are two adversaries who dispute about their Lord; then (as to) those who disbelieve, for them are cut out garments of fire, boiling water shall be poured over their heads.
Then pour above his head of the torment of the boiling water:
That We pour down the water, pouring (it) down in abundance,
Therefore your Lord let down upon them a portion of the chastisement.