Yevamot 93a and Yevamot 93b, examples of rabbis who accepted the possibility of legal actions regarding items not yet present in the halachic world, called a davar she-lo ba la-olam.
Yevamot 93a and Yevamot 93b, examples of rabbis who accepted the possibility of legal actions regarding items not yet present in the halachic world, called a davar she-lo ba la-olam.