Cross reference
Numbers 13:25
25 And they turn back from spying the land at the end of forty days.
Exodus 24:18
18 and Moses goeth into the midst of the cloud, and goeth up unto the mount, and Moses is on the mount forty days and forty nights.
Exodus 34:28
28 And he is there with Jehovah forty days and forty nights; bread he hath not eaten, and water he hath not drunk; and he writeth on the tables the matters of the covenant -- the ten matters.
Numbers 14:33-34
33 and your sons are evil in the wilderness forty years, and have borne your whoredoms till your carcases are consumed in the wilderness;
34 by the number of the days `in' which ye spied the land, forty days, -- a day for a year, a day for a year -- ye do bear your iniquities, forty years, and ye have known my breaking off;