لِرَبِّكَ

لِرَبِّكَ is a phrase (شِبْهُ الجُمْلَةِ) consisting of a genitive particle and a possessive nominal compound

PhraseParticle / Noun / NounNounNoun Particle
شِبْهُ الجُمْلَةِجَارٌ وَمَجْرُوْرٌ وَهُوَ مُضَافٌ وَ مُضَافٌ إِلَيْهِمُضَافٌ إِلَيْهِاسْمٌ مَجْرُوْرٌ وَهُوَ مَضَافٌحَرْفُ جَرٍّ
PhraseCompoundPossessive NounGenitive noun + Noun possessedParticle of pulling down
  
to your Lordلِرَبِّكَ=كَ+رَبِّ+لِ
to your Lordyourslord ofto
Surah/Below are the 3 verses in the holy Quran containing the compoundلِرَبِّكَ
Verse
37-49  
74-7and for your Lord, endure (be patient)وَلِرَبِّكَ فَاصْبِرْ
108-2So, pray to your Nurturer and sacrificeفَصَلِّ لِرَبِّكَ وَانْحَر