Cross reference
Numbers 13:25
25 And they returned from spying out the land at the end of forty days.
Exodus 24:18
18 And Moses entered into the midst of the cloud, and went up into the mount: and Moses was in the mount forty days and forty nights.
Exodus 34:28
28 And he was there with Jehovah forty days and forty nights; he did neither eat bread, nor drink water. And he wrote upon the tables the words of the covenant, the ten commandments.
Numbers 14:33-34
33 And your children shall be wanderers in the wilderness forty years, and shall bear your whoredoms, until your dead bodies be consumed in the wilderness.
34 After the number of the days in which ye spied out the land, even forty days, for every day a year, shall ye bear your iniquities, even forty years, and ye shall know my alienation.