Luqman · Ayah 13
وَإِذْ قَالَ لُقْمَٰنُ لِٱبْنِهِۦ وَهُوَ يَعِظُهُۥ يَٰبُنَىَّ لَا تُشْرِكْ بِٱللَّهِ إِنَّ ٱلشِّرْكَ لَظُلْمٌ عَظِيمٌ
And [mention, O Muḥammad], when Luqmān said to his son while he was instructing him, "O my son, do not associate [anything] with Allāh. Indeed, association [with Him] is great injustice."
Quran 31:13 (Luqman) · Saheeh International, Noor International Center (QuranEnc v1.1.2)