Musannaf Ibn Abi Shayba 13:2570

Abu Bakr narrated to us, he said: Isma'il ibn 'Ulayyah narrated to us, from Ayyub, from Muhammad, that he used to see no harm in [exchanging] an animal for an animal, while the dirhams for the animal are paid immediately and the dirhams [for the other] are deferred.