So we see that they were not able to enter, because of their unbelief.
OJBAnd so we see that they were not able to enter because of lack of Emunah.
TCENTSo we see that it was because of their unbelief that they were not able to enter.
T4TSo, from that example we (inc) realize that it was because they did not keep trusting in God that they were unable to enter the land where they would rest.