NET
18 Moses went into the cloud when he went up the mountain, and Moses was on the mountain forty days and forty nights.
Darby
18 And Moses went into the midst of the cloud, and ascended the mountain. And Moses was on the mountain forty days and forty nights.
KJV
18 And Moses went into the midst of the cloud, and gat him up into the mount: and Moses was in the mount forty days and forty nights.