God is One

Say: God is One, The Eternal God. He begot none, nor was He begotten. None is equal to Him (112:1-4).

Mankind, worship your Lord, who has created you and those before you, so that you may ward off evil; who has made the earth a couch for you and the sky a canopy; and has sent down water from the sky, thereby producing fruits for you to eat. So do not knowingly set up rivals to God (2:21-22).

God does not forgive partners being ascribed to Him. He forgives whom He will all other sins. Whoever ascribes partners to God has strayed far from the truth (4:116).