In the fifth aliyah, since Bilam didn't curse the Jews yet, Balak now takes Bilam to another place, namely the top of Pisgah, and Balak hopes that Bilam would be able to curse the Jews from there. Rashi says that Balak knew that this was an unfavorable place for the Jews because this was where Moshe Rabeinu would eventually pass away. They build seven altars and make offerings again, then G-d puts further words in Bilam's mouth. According to Rashi, Bilam says that G-d has already sworn to bring the Jews to Israel, so they cannot be stopped. He says that there is no iniquity or perverseness in the Jews and the friendship of the King is with them.