There would be among them those to whom the fire will reach up to their ankels and to some of them the fire would reach their knees and to some it would reach their waists and to some it would reach up to their collar-bones. (Using translation from Muslim 2845b)
أَنَّهُ سَمِعَ نَبِيَّ اللهِ ﷺ يَقُولُ إِنَّ مِنْهُمْ مَنْ تَأْخُذُهُ النَّارُ إِلَى كَعْبَيْهِ وَمِنْهُمْ مَنْ تَأْخُذُهُ النَّارُ إِلَى رُكْبَتَيْهِ وَمِنْهُمْ مَنْ تَأْخُذُهُ النَّارُ إِلَى حُجْزَتِهِ وَمِنْهُمْ مَنْ تَأْخُذُهُ النَّارُ إِلَى تَرْقُوَتِهِ