No, the belief that the number 13 is unlucky is not supported in Islam. Considering any number, including 13, as unlucky is a form of superstitious belief, known as tatayyur in Islam, which is forbidden. Numbers and dates have no inherent connection to good or bad fortune.
Islam strongly discourages superstitions. Attributing good or bad luck to numbers, days, colors, or any other inanimate object contradicts the Islamic belief that Allah is the ultimate controller of destiny. Fortune and misfortune come from Allah alone, and not from any arbitrary number or date.
The belief that certain numbers or dates are unlucky is a pre-Islamic (Jahiliyyah) practice that Islam aims to eradicate. Muslims should place their trust in Allah and avoid such baseless superstitions. Focusing on these superstitions can distract Muslims from their faith and reliance on Allah.
