Bamidbar Chapter 9 covers the command to perform the Korban Pesach in the desert and the origin of Pesach Sheni — a second chance in the second month for those who were ritually impure or on a distant journey and couldn't bring the offering at its appointed time. The chapter then transitions to the protocol for Israel's travel in the wilderness, governed entirely by the cloud over the Mishkan: when it lifted they traveled, when it rested they camped, with the passage elaborating this pattern in a song-like repetition celebrating divine guidance.