Numbers 14:22, 33-34

because all these men who have seen My glory and the signs which I did in Egypt and in the wilderness, and have put Me to the test now these ten times, and have not heeded My voice

And your sons shall be shepherds in the wilderness forty years, and bear the brunt of your infidelity, until your carcasses are consumed in the wilderness. According to the number of the days in which you spied out the land, forty days, for each day you shall bear your guilt one year, namely forty years, and you shall know My rejection.