Strong’s Hebrew
H6783 — tsmiythuth
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
צְמִיתֻת
tsmiythuth — pronounced tsem-ee-thooth
or tsmithuth {tsem-ee-thooth'}; from 6789; excision, i.e. destruction; used only (adverbially) with prepositional prefix to extinction, i.e. perpetually:--ever. see H06789
2 occurrences in the KJV.
Leviticus 25:23
The land shall not be sold for ever: for the land is mine, for ye are strangers and sojourners with me.
Leviticus 25:30
And if it be not redeemed within the space of a full year, then the house that is in the walled city shall be established for ever to him that bought it throughout his generations: it shall not go out in the jubile.