رَبَّ هَذَا

رَبَّ هَذَا is a phrase (شِبْهُ الجُمْلَةِ), a compound consisting of a possessed noun and a possessive noun

PhraseNoun / NounNounNoun
شِبْهُ الجُمْلَةِمُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِمُضَافٌ
PhrasePossessive compoundPossessive noun/ownerNoun possessed/owned
the Lord of thisرَبَّ هَذَا=هَذَا+رَبَّ
the Nurturer of thisthisthe Nurturer/Lord of
Surah/Below is the only verse in the holy Quran containing the compoundرَبَّ هَذَا
Verse
106-3So, let them worship the Lord of this houseفَلْيَعْبُدُوْا رَبَّ هَذَا الْبَيْتِ