The Cow - 2:221
Do not marry women who associate partners unless they believe. A believing servant woman is better than a woman who associates partners, even if you like her. And do not marry your daughters to men who associate partners until they believe. A believing servant boy is better than one who associates partners, even if you like him. They call to the Fire. Allah, on the other hand, calls to Paradise and forgiveness, and He makes His verses clear to the people so that they may take admonition.
Who cannot enter Paradise?
The Table Spread/5:72
"Those who say: "Allah is the Messiah, son of Mary,"have certainly disbelieved. But the Messiah said, "Children of Israel, serve Allah, my Lord and your Lord. Whoever associates partners with Allah, Allah forbids him Paradise, and his abode will be the Fire. And there will be no helper for the wrongdoers."
The Heights/7:40
The gates of heaven will not open for those who deny Our Verses and are arrogant against them, and they will not enter Paradise until the camel passes through the eye of a needle. This is how We punish the guilty.
The Women/4:116
Allah does not forgive associating partners with Him (if it continues until death), but He forgives the sins below that to whom He wills. Whoever associates partners with Allah has gone astray.
The Cow/2:214
"Or do you think that you will enter Paradise until the like of what happened to those before you befalls you? They suffered hardship and distress and were so shaken that the apostle and those who believed with him said, "When is the help of Allah?"Know well that Allah´s help is near."
The Family Of Imran/3:142
Do you think that you will enter Paradise until Allah reveals the workers among you and separates those who are patient?
The Cattle/6:82
Those who believe and do not mix their faith with wrongdoing, they deserve security and they have found the truth.