“I said to you, ‘You have come to the hill country of the Amorites which the LORD our God is about to give us Deu 1:20 Moses said Canaan is the promise. Believe the promise.
Lord lead the whole nation from Egypt to East of Jordan, where they were about to enter the promised land. Moses realized it. Moses said ‘See, the LORD your God has placed the land before you; go up, take possession, Deu 1:21. Possess the promise.
But people instead of going and taking possesion, they wanted more confirmation. Therefore people, “Then all of you approached me and said, ‘Let us send men before us, that they may search out the land for us, and bring back to us word of the way by which we should go up and the cities which we shall enter. Deu 1:22 Doubting the promises of God, people wanted to see and confirm. Believing that was driven by sight.
This single act lead to 40 years more of wandering. They send spies to check and confirm if their is a possibility for the promises of God to happen. We know 10 of the 12 spies went came back discouraged. All this happened just beacuse people wanted to see a confirmation beforing believing.