At the end of Chapter 27, we read about the appointment of Joshua as Moses’ successor and Chapters 28 and 29 lists the sacrifices brought daily, on Shabbat, and the Festivals. Rashi points out that the daily sacrifice was already taught in the book of Exodus (Parashat Tetzave) so its repetition here is redundant. Ralbag explains that Joshua was not going to have the same level of prophecy as Moses – who began to communicate with God without the sacrifices – and therefore he would need additional help in that area. The daily sacrifices, today replaced by Torah study and prayer, would boost his prophetic talent. To stress this point it is repeated and follows his appointment.