Musannaf Ibn Abi Shayba 13:986

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Mis’ar narrated to us, from Ibrahim ibn Muhammad ibn al-Muntashir, from his father, he said: Masruq used to like the price of water. Waki’ said: Meaning the water-carrying (as-siqayah) from the load and the back (animal) by selling it.