Musannaf Ibn Abi Shayba 19:604

Abu Bakr narrated to us, he said: Isma'il bin Ibrahim narrated to us, from Ash'ath, from his father, he said: I witnessed Abu Barzah establish the prescribed punishment (hadd) upon a slave-girl of his in his hallway, and with him were a group of his companions. He said: Flog her with a flogging between the two floggings, neither with excessive stretching nor with leniency.