Musannaf Ibn Abi Shayba 28:838

Muhammad ibn Bakr narrated to us, Ibn Jurayj narrated to us, from ‘Ata’, that he disliked carrying weapons to the enemy. I said to him, "Do you carry horses to them?" He refused that and said, "As for what strengthens them for fighting, then no. But as for other than that, there is no harm in it." And ‘Amr ibn Dinar said the same.