إِلَى الجِبَالِ

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

PhraseParticle / NounNoun Particle
شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌاسْمٌ مَجْرُوْرٌحَرْفُ جَرٍّ
PhraseCompoundGenitive NounParticle of pulling down
  
at the mountainsإِلَى الجِبَالِ=الجِبَالِ+إِلَى
to the mountainsthe mountainsto/at
Surah/Below is the only verse in the holy Quran containing the preposition and genitive noun compoundإِلَى الجِبَالِ
Verse
88-19and at the mountains, how they are rooted?وَإِلَى الجِبَالِ كَيْفَ نُصِبَتْ