What is the ruling regarding the share of spoils for one who fights using a forcibly taken (ghasab) horse?

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One possible ruling is that the horse's share follows the fate of the fighter, treating the situation analogously to the fighter's own horse, because the horse is subsidiary to the fighter in matters of ruling. An alternative ruling states that the horse's share belongs entirely to its original owner. This is based on the rationale that the damage and injury are the responsibility of the rider, and since the horse belongs to another, its share should be reserved for the owner, just as if a slave fought on his master's horse.