Surah Luqman, Verse 13
وَإِذْ قَالَ لُقْمَٰنُ لِٱبْنِهِۦ وَهُوَ يَعِظُهُۥ يَٰبُنَىَّ لَا تُشْرِكْ بِٱللَّهِ ۖ إِنَّ ٱلشِّرْكَ لَظُلْمٌ عَظِيمٌۭ
Translation — Sahih International
And [mention, O Muhammad], when Luqman said to his son while he was instructing him, "O my son, do not associate [anything] with Allah. Indeed, association [with him] is great injustice."
Source
Kur'an-ı Kerim, Lokmân Suresi 31:13
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/31-suresi-13-ayet