Final answer:
The Bible Book detailing the Israelites' entry into Canaan and Jericho's fall is Joshua, in which it describes their leader Joshua's conquests.
Step-by-step explanation:
The Bible Book that deals with the Israelites' entry into Canaan and the fall of Jericho is the book of Joshua. This Biblical account describes how under Joshua's leadership, after the death of Moses, the Israelites crossed the Jordan River into Canaan and captured the city of Jericho, as famously recounted in the story where the walls of Jericho fell after Joshua and his men marched around the city blowing their horns. Although archaeological evidence concerning the fall of Jericho as described is contested or lacking, the book of Joshua remains a crucial part of the Hebrew Bible, providing an account of how the Israelites began to settle in the land of Canaan.