'Sware' in the Bible

Because Jehovah was not able to bring this people into the land which he sware unto them, therefore he hath slain them in the wilderness.

surely they shall not see the land which I sware unto their fathers, neither shall any of them that despised me see it:

surely ye shall not come into the land, concerning which I sware that I would make you dwell therein, save Caleb the son of Jephunneh, and Joshua the son of Nun.

And Jehovah's anger was kindled in that day, and he sware, saying,

Surely none of the men that came up out of Egypt, from twenty years old and upward, shall see the land which I sware unto Abraham, unto Isaac, and unto Jacob; because they have not wholly followed me: