It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Do not make deals with traders outside (the market), and do not tie the teats of a goat or she-camel in order to sell it at a higher price. Whoever (falls victim to this deception and) buys such a she-camel or goat, then he has the choice of two things, whichever is better for him: either he keeps the animal with himself (and settles the matter), or he returns the animal to its owner and gives a sa’ (measure) of dates along with it.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7305