Reference for Bava Metzia 31:2
סוף סוף קרו ליה בני לוקח גזלנא
But according to the view [of R. Ashi, viz.,] 'he wished to vindicate his honesty,' [it could be applied even to this case], as he [the robber] would wish to vindicate his honesty before [the buyer's] children also. [But, it is argued,] would not the buyer's children call him [who sold the field to their father] a robber?<span class="x" onmousemove="('comment',' Even when the buyer is dead, the desire on the part of the seller to vindicate his honesty may still have been the motive for his action in buying the field from the rightful owner, as the children of the dead buyer would call him a robber when they discover that the field was sold to their father unlawfully, and that they could not retain possession of it. ');"><sup>2</sup></span>