Numbers 14:30-34

Except for Caleb the son of Jephunneh and Joshua the son of Nun, not one of you shall enter the land in which I swore [an oath] to settle you. But your children whom you said would become plunder, I will bring in, and they will know the land which you have despised and rejected. But as for you, your dead bodies will fall in this wilderness. Your sons shall be wanderers and shepherds in the wilderness for forty years, and they will suffer for your unfaithfulness (spiritual infidelity), until your corpses are consumed in the wilderness. According to the number of days in which you spied out the land [of Canaan], forty days, for each day, you shall bear and suffer a year for your sins and guilt, for forty years, and you shall know My displeasure [the revoking of My promise and My estrangement because of your sin].