What is the ruling on riding a *Jallalah* animal?

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Riding a *Jallalah* is disliked. This is the position of Umar, his son, and the proponents of *Ra'y* (opinion). The evidence for this is the narration from Abdullah ibn Amr, where the Prophet prohibited riding them. The justification also involves the concern that the animal might sweat, thereby polluting the rider with its sweat.