لَهُم

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

PhraseParticle / NounNoun Particle
شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌاسْمٌ مَجْرُوْرٌحَرْفُ جَرٍّ
PhraseCompoundGenitive NounParticle of pulling down
  
for themلَهُم=هُم+لَ
for themthemfor/belongs to
Surah/Below are the 2+ verses in the holy Quran containing the compoundلَهُم
Verse
the messenger of Allah (SWT) Salih (as) said to themفَقَالَ لَهُم رَسُوْلُ اللهِ
91-13“that is the she-camel of Allah (SWT) and her drink”نَاقَةَ اللهِ وَسُقْيَاهَا
Except those who believe and do righteous deedsإِلَّا الَّذِيْنَ ءَامَنُوْا وَعَمِلُوْا الصَّالِحَاتِ
95-6for them is a reward without endفَلَهُمْ أَجْرٌ غَيْرُ مَمْنُوْنٍ