In the first aliyah Moshe recounts how he pleaded with G-d to let him enter Israel, but that Moshe wasn't allowed to enter the land because of the incident of the waters of Maribah where he struck the rock. Instead Moshe was allowed to see the Promised Land from the top of a mountain. At the end of the aliyah, Moshe discusses the incident of the Baal Peor where many Jews died as a result of their idol worship. He says this as a warning to get the Jewish people to heed the laws that will soon be reviewed.