The basic principle is that zina is a greater sin than gambling and drinking alcohol

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They committed zina, then they repented and got married, but she is sure that they will be punished and their children will be deformed
Woman who accepts Islam and whose husband is a kaafir

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Related Answers:
Is it permissible for one who has committed zina (fornication or adultery) to get married after he or she has repented?
Can those who have committed homosexual acts be forgiven, and is it permissible for such a person to get married?
Incest is a worse and more serious sin
They committed zina, then they repented and got married, but she is sure that they will be punished and their children will be deformed
Woman who accepts Islam and whose husband is a kaafir

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