Reference for Bekhorot 4:62
והנותן בקבלה אע"פ שאינו רשאי קונסין אותו עד עשרה בדמיו ונותן כל דמיו לכהן
Come and hear: R'Judah said: If one receives an animal from a heathen to look after and it gives birth [to a first-born] we settle [wit the gentile partner] for what it is worth and half of its value is given to the priest.
Jastrow
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