Surah Luqman 31:13

وَإِذْ قَالَ لُقْمَـٰنُ لِٱبْنِهِۦ وَهُوَ يَعِظُهُۥ يَـٰبُنَىَّ 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."

Translation: Saheeh International

Tafsir

And mention when Luqmān said to his son when he was admonishing him ‘O my son yā bunayya is an affectionate diminutive of yā ibnī do not ascribe partners to God idolatry is truly a tremendous wrong’ so return to him in repentance and submit to Him.

Excerpt from Tafsir al-Jalalayn, commentary on 31:13, via Quran.com. The reader has the full commentary and 9 more tafsirs.