Musannaf Ibn Abi Shayba 13:1062

Abu Bakr narrated to us, he said: Hafs bin Ghiyath narrated to us, from Ubaydullah bin Abd al-Rahman bin Mawhab, from Hafs bin al-Mu'tamir, from his father, that Ali said: "There is no harm in giving money in Medina and taking [it] in Ifriqiya."