وَإِذْ قَالَ لُقْمَـٰنُ لِٱبْنِهِۦ وَهُوَ يَعِظُهُۥ يَـٰبُنَىَّ لَا تُشْرِكْ بِٱللَّهِ ۖ إِنَّ ٱلشِّرْكَ لَظُلْمٌ عَظِيمٌ
Wa iz qaala luqmaanu libnihee wa huwa ya'izuhoo ya bunaiya laa tushrik billaah; innash shirka lazulmun 'azeem
Luqman counselled his son, ‘My son, do not attribute any partners to God: attributing partners to Him is a terrible wrong.’
And when Luqman said to his son, counseling him: "My dear son, ascribe no partner to God — to ascribe partners to him is a tremendous wrong."
Luqman is remembered as a sage given wisdom, and the first thing that wisdom produces in the surah is a word to his own child. The diminutive ya bunayya is tender address carrying the gravest warning, and zulm names a thing put where it does not belong. Two verses on, God's own voice limits obedience to parents at exactly this point, which quietly bounds the authority of the father speaking.