Abu Dawud Book 9, Hadith Number 2793.

Narated By ‘Asim b. Kulaib on the authority of his father : We were with a man from the Companions of the Prophet (PBUH) called Mujashi’ who belonged to Banu Sulaim. There was a scarcity of goats (in those days). He commanded a man to announce (among the people); so he announced that the Apostle of Allah (PBUH) used to say: A lamb may be given as full payment for that for which a full grown animal is payment.

Abu Dawud said: His name is Mujashi’ b. Mas’ud.