Muhammad bin 'Ubaid al-Tanafasi محمد بن عبيد بن أبي أمية الطنافسي · Wages (Kitab Al-Ijarah)

The Prophet (ﷺ) forbade to bid against one another.

The Prophet (ﷺ) said: If anyone finds an animal whose owners were helpless to provide fodder to it and so they turned it out (of their house), and he took it and looked after it, it will belong to him. Abu Dawud said: This is the tradition of Hammad. It is more plain and perfect.