Musnad Abu Ya'la al-Mawsili 159:23

Abu Khaythama narrated to us, Sufyan narrated to us, from Abu al-Zinad, from al-A’raj, from Abu Hurayrah, reaching it [to the Prophet (ﷺ)], he said: The Hour will be established while a man is milking his she-camel, and he will not reach the vessel to his mouth before it is established. And two men will be trading a garment, and they will not have finished trading it before it is established. And a man will be plastering his trough, and he will not have departed from it before it is established.