13وَإِذ قالَ لُقمانُ لِابنِهِ وَهُوَ يَعِظُهُ يا بُنَيَّ لا تُشرِك بِاللَّهِ ۖ إِنَّ الشِّركَ لَظُلمٌ عَظيمٌ(Muntakhab)In exhorting his son Loqman said: "O my son, never Incorporate with Allah other deities, for polytheism is a grave offense and an unforgivable sin indeed".