Abba Halifa of Keruya asked Rabbi Hiyya bar Abba why reported that 70 people from Jacob's household came to Egypt, while enumerated only 69 individuals. Rabbi Hiyya first argued that the Hebrew word "et" preceding Dinah in indicated that Dinah had a twin sister, and the twin brought the total to 70. But Abba Halifa responded that if that were so, then the parallel language of would indicate that Benjamin also had a twin sister. Rabbi Hiyya then revealed his real explanation, which he called "a precious pearl": Rabbi Hama bar Hanina taught that the seventieth person was Moses' mother Jochebed, who was conceived on the way from Canaan to Egypt and born as Jacob's family passed between the city walls as they entered Egypt, for reported that Jochebed "was born to Levi in Egypt," implying that her conception was not in Egypt.