Musannaf Ibn Abi Shayba 28:97

Narrated to us Abd al-Rahim ibn Sulayman, from Muhammad ibn Ishaq, from Amr ibn Shu’ayb, from his father, from his grandfather, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is no *jalab* (bringing animals to the market to sell them at a higher price) and no *janab* (the tax collector staying away from the people's homes to collect zakat)."