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the best reference is the verse(s) of the holy Quran that I suggest you to read some of them. Such as:

And those who do not invoke with Allah another deity or kill the soul which Allah has forbidden [to be killed], except by right, and do not commit unlawful sexual intercourse. And whoever should do that will meet a penalty. (68) Multiplied for him is the punishment on the Day of Resurrection, and he will abide therein humiliated - (69)

And do not approach unlawful sexual intercourse. Indeed, it is ever an immorality and is evil as a way. (32) اسراء /

“And come not near to unlawful sex. Verily, it is a Faahishah (i.e. anything that transgresses its limits: a great sin), and an evil way (that leads one to hell unless Allaah Forgives him)”

[al-Isra’ 17:3

Allaah did not only forbid zina itself, rather He forbade coming near to it. The aim here is to forbid the things that lead to it. We ask Allaah to conceal your sin and to forgive you, and to help you to repent sincerely.

Secondly:

There is no doubt that zina is a grave sin, and it is one of the major sins. Hence the punishment for it is one that points to the seriousness of this sin and the abhorrence with which it is regarded in sharee’ah and by wisdom and common sense.

Thank you so much for the prompt response ..... and thank you for the references .... Be blessed :)

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