The first aliyah begins with the Jews being told of a blessing if they obey G-d's commandments, and a curse if they don't. Their instructions are that they should destroy all the idols and altars found in the land of Israel. Then they are told that G-d will, in the future, designate a specific place for sacrifices and other avodah (service to G-d) that they presently do in the Mishkan, and of course, that place will turn out to be Yirushalayim (Jerusalem).