Numbers 14:33-35

33And your children shall be shepherds in the wilderness forty years and shall suffer for your faithlessness, until the last of your dead bodies lies in the wilderness.

34According to the number of the days in which you spied out the land, forty days, a year for each day, you shall bear your iniquity forty years, and you shall know my displeasure.'

35I, the Lord, have spoken. Surely this will I do to all this wicked congregation who are gathered together against me: in this wilderness they shall come to a full end, and there they shall die."