'Sware' in the Bible

Because the LORD 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 provoked me see it:

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

And the LORD'S anger was kindled the same time, 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: