بِجَهَنَّمَ

بِجَهَنَّمَ is a phrase (شِبْهُ الجُمْلَةِ) consisting of a particle of pulling down (a preposition) and a genitive noun

PhraseParticle / NounNoun Particle
شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌاسْمٌ مَجْرُوْرٌحَرْفُ جَرٍّ
PhraseCompoundGenitive NounParticle of pulling down/Preposition
  
Hellبِجَهَنَّمَ=جَهَنَّمَ+بِ
the hellthe hell
Surah/Below is the only verse in the holy Quran containing the phraseبِجَهَنَّمَ
Verse
and that day Hell will be brought nearوَجِاْئَ يَوْمَئِذٍ بِجَهَنَّمَ
89-23on that day man will remember, but how will that remembrance avail him?يَوْمَئِذٍ يَتَذَكَّرُ الإِنْسَانُ وَأَنَّى لَهُ الذِّكْرَى