פירוש על קידושין 33:2

We might have thought that in the case where a slave runs away and then the Jubilee arrives he does get a gift, since the Jubilee would have set him free under all circumstances, and indeed, means that he does not need to complete his term of servitude. Therefore, the baraita comes to teach us that he does not receive a gift since he ran away and was not sent away by the Jubilee.