In Islamic law, transactions are evaluated not only by their outward permissibility but also by their purpose and consequences. A central principle in fiqh is that assisting directly in sin or in the establishment of what Allah has prohibited is itself impermissible. Allah تعالى says: “And cooperate in righteousness and piety, but do not cooperate in sin and transgression.” (Qur’an 5:2)

Marriage in Islam is a defined institution between a man and a woman. Acts that directly facilitate or celebrate a union that Islam does not recognize fall under the category of cooperation in impermissible matters. Classical and contemporary scholars agree that while Muslims must uphold justice, kindness, and respectful conduct toward all people, they are not permitted to materially assist in acts or institutions that contradict clear Islamic teachings.

Providing a wedding cake is not a neutral service like selling general food to the public; rather, it is a service specifically tied to celebrating and formalizing a wedding. When the service is knowingly provided for a same-sex wedding, it becomes a direct contribution to the celebration and facilitation of a relationship that Islam does not permit. In such a case, the transaction is not considered permissible, because the work itself is inseparable from the impermissible event.

This ruling is based on intent and knowledge. If a baker unknowingly provides a service without awareness of the nature of the event, there is no sin upon them, as Allah says: “There is no blame upon you for what you did by mistake, but only for what your hearts intended.” (Qur’an 33:5) However, once it is known that the service is for a same-sex wedding, continuing knowingly would fall under prohibited cooperation.

At the same time, Islam does not command harshness, hostility, or humiliation. Declining such work should be done with professionalism, dignity, and respect, without insults or moral judgment. The Prophet ﷺ demonstrated mercy and upright conduct in all interactions, while remaining firm upon principle.

It is also important to distinguish between general business dealings and event-specific services. Selling standard products to the public without involvement in a prohibited act is not the same as creating a custom wedding cake whose sole purpose is to celebrate a specific union. The latter carries a direct causal link to the impermissible act.