The book of Numbers comes from the Septuagint (LXX) and is named for the census lists found in chapters 1 and 26. The Hebrew title of this book is "bemidbar" and means "in the desert," which covers the content of the book more accurately. This is the record of the ca. 40 year wilderness wanderings of Israel before they entered the Promised Land.
Eight principles of Christian leadership are given and then illustrated in the life of Moses. Particular emphasis is given on dealing with opposition.
Of the ten spies, only Joshua and Caleb gave a positive report. Thus Israel was unable to possess the Promised Land due to unbelief. Eventually, the next generation of Israel believed God and entered Canaan.
Meribah means quarreling. Due to a lack of water, Israel quarreled with Moses. Sadly, Moses did not follow the instructions of the LORD perfectly in giving water to the people and thus was prevented from entering the Promised Land.
A change of leadership from Moses to Joshua takes place. This is covered in Numbers 27, Deuteronomy 34 and Joshua 1.