In the sixth aliyah G-d tells Avrom that his descendants, the Jewish people, will be exiled in a strange land under bondage for 400 years.
Also in this aliyah, Hagar, Sarai's handmaid becomes a second wife to Avrom, and she bears him a son named Yishmael. (Hagar was Pharaoh's daughter. Upon seeing the miracles for Sarai in Egypt, Pharaoh said: "better she should be Sarai's handmaid then a princess in another house.")
At the very end of the aliyah, G-d adds the letter "Hay" to Avrom's name, making it Avrohom.
