A tomb is a small building (or "vault") for the remains of the dead, with walls, a roof, and (if it is to be used for more than one corpse) a door. It may be partly or wholly in the ground (except for its entrance) in a cemetery, or it may be inside a church proper or in its crypt. Single tombs may be permanently sealed; those for families (or other groups) have doors for access whenever it is needed.
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This is an article from the public domain Easton's Bible Dictionary, originally published in 1897.
This article is written from a nineteenth century Christian viewpoint, and may not reflect modern opinions or recent discoveries in Biblical scholarship.
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Tombs - of the Hebrews were generally excavated in the solid rock, or
were natural caves. Mention is made of such tombs in Judg. 8:32;
2 Sam. 2:32; 2 Kings 9:28; 23:30. They were sometimes made in
gardens (2 Kings 21:26; 23:16; Matt. 27:60). They are found in
great numbers in and around Jerusalem and all over the land.
They were sometimes whitewashed (Matt. 23:27, 29). The body of
Jesus was laid in Joseph's new rock-hewn tomb, in a garden near
to Calvary. All evidence is in favour of the opinion that this
tomb was somewhere near the Damascus gate, and outside the city,
and cannot be identified with the so-called "holy sepulchre."
The mouth of such rocky tombs was usually closed by a large
stone (Heb. golal), which could only be removed by the united
efforts of several men (Matt. 28:2; comp. John 11:39). (See Golgotha[?].)
From Easton's Bible Dictionary (1897)
Tombs in the Bible