No Associates

Do not be among those who associate others with Allah.

10:105And, (O Muhammad) set thy purpose resolutely for religion, as a man by nature upright, and be not of those who ascribe partners (to Allah).

10:106And cry not, beside Allah, unto that which cannot profit thee nor hurt thee, for if thou didst so then wert thou of the wrong-doers.

28:87And let them not divert thee from the revelations of Allah after they have been sent down unto thee; but call (mankind) unto thy Lord, and be not of those who ascribe partners (unto Him).

28:88And cry not unto any other god along with Allah. There is no Allah save Him. Everything will perish save His countenance. His is the command, and unto Him ye will be brought back.

30:31Turning unto Him (only); and be careful of your duty unto Him and establish worship, and be not of those who ascribe partners (unto Him);

72:2Which guideth unto righteousness, so we believe in it and we ascribe no partner unto our Lord.

Whoever associates partners with Allah, Paradise is forbidden to them

5:72They surely disbelieve who say: Lo! Allah is the Messiah, son of Mary. The Messiah (himself) said: O Children of Israel, worship Allah, my Lord and your Lord. Lo! whoso ascribeth partners unto Allah, for him Allah hath forbidden paradise. His abode is the Fire. For evil-doers there will be no helpers.

Be upright for Allah, not associating anything with Him.

22:31Turning unto Allah (only), not ascribing partners unto Him; for whoso ascribeth partners unto Allah, it is as if he had fallen from the sky and the birds had snatched him or the wind had blown him to a far-off place.

We will cast fear into the hearts of those who disbelieve because they associate partners with Allah, something He has never authorized.

3:151We shall cast terror into the hearts of those who disbelieve because they ascribe unto Allah partners, for which no warrant hath been revealed. Their habitation is the Fire, and hapless the abode of the wrong-doers.

Those who disbelieved and turned others away from Allah’s path will face multiplied punishment for their corruption.

16:88For those who disbelieve and debar (men) from the way of Allah, We add doom to doom because they wrought corruption,

What you call them to is burdensome for the idolaters.

42:13He hath ordained for you that religion which He commended unto Noah, and that which We inspire in thee (Muhammad), and that which We commended unto Abraham and Moses and Jesus, saying: Establish the religion, and be not divided therein. Dreadful for the idolaters is that unto which thou callest them. Allah chooseth for Himself whom He will, and guideth unto Himself him who turneth (toward Him).