Cross reference
Numbers 13:25
25 They returned from spying out the land at the end of forty days.
Exodus 24:18
18 Moses entered into the midst of the cloud, and went up on the mountain; and Moses was on the mountain forty days and forty nights.
Exodus 34:28
28 He was there with Yahweh forty days and forty nights; he neither ate bread, nor drank water. He wrote on the tablets the words of the covenant, the ten commandments.
Numbers 14:33-34
33 Your children shall be wanderers in the wilderness forty years, and shall bear your prostitution, until your dead bodies be consumed in the wilderness.
34 After the number of the days in which you spied out the land, even forty days, for every day a year, shall you bear your iniquities, even forty years, and you shall know my alienation.