What is the ruling on whistling—whether it is for a tune or to call someone very far away?

Scholars differ on the ruling concerning whistling, holding three opinions: prohibition and unlawfulness, based on it being a characteristic of the pre-Islamic era (Jahiliyyah) and Allah's condemnation of the disbelievers of Quraish for it in His saying: (And their prayer at the House was nothing but whistling and clapping), and detestability (karahah) because it resembles the actions of the disbelievers, and permissibility, based on the absence of an explicit text prohibiting or deeming it detestable, and that the verse condemns taking whistling as an act of worship. The most probable opinion is that it is detestable, especially if there is no need for it, unless it is used to harm people, harass, or imitate transgressors, in which case it is unanimously unlawful. Some scholars are of the view that the whistling (muka') and clapping (tasdiyah) in the verse were for mockery and to disrupt the recitation of the Qur'an, rather than being an act of worship in themselves.