Numbers 13 records the Israelite spies returning to Moses and the congregation at Kadesh after exploring Canaan. Although they brought fruit demonstrating the land's abundance, ten spies emphasized the strength of its inhabitants. Israel refused to enter the land, despite the faith of Joshua and Caleb.
The resulting judgment condemned that generation to wander in the wilderness rather than immediately possess Canaan. Kadesh therefore became closely associated with Israel's unbelief and the prolonged wilderness period.
Numbers 20 places Miriam's death at Kadesh. When the people complained about the lack of water, Moses struck the rock rather than following God's command precisely, and Moses and Aaron were told that they would not bring the congregation into the land.
From Kadesh, Moses also sent messengers requesting permission to pass through Edom, but the king of Edom refused.