(Lukman) 31 : 13
وَإِذْ قَالَ لُقْمَانُ لِابْنِهِ وَهُوَ يَعِظُهُ يَا بُنَيَّ لَا تُشْرِكْ بِاللَّهِ ۖ إِنَّ الشِّرْكَ لَظُلْمٌ عَظِيمٌ

And remember what Lukman said while he was advising his son, he told: “Oh my son! You don’t associate anything with Allah; indeed associating anything with Allah is a severe injustice. 

It is told in verse 4: 48 that Lord Allah will not forgive associating anyone with Him, while He forgives anything besides that for whom He Wishes. If anyone associates anything with Allah, then surely he has forged severe sin. The hypocrites who hide the Three Time Knowledge Adhikr which submits the Three Time Knower Lord of the universe are the transgressors as explained in verses 9: 67-68. They and their blind followers are the worst creatures and most strayed who will be dragged on their faces to Hell as told in verses 25: 33-34. See explanation 2: 254; 6: 21, and 30: 42-44.