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Easton's Bible Dictionary
Paul found among the many altars erected in Athens one bearing the inscription, "To the unknown God" ( Acts 17:23 ), or rather "to an [i.e., some] unknown God." The reason for this inscription cannot now be accurately determined. It afforded the apostle the occasion of proclaiming the gospel to the "men of Athens."
The first altar we read of is that erected by Noah (Genesis 8:20 ). Altars were erected by Abraham (Genesis 12:7; 13:4; 22:9 ), by Isaac (Genesis 26:25 ), by Jacob (33:20; 35:1,3), and by Moses (Exodus 17:15 , "Jehovah-nissi").
In the tabernacle, and afterwards in the temple, two altars were erected.
This altar, as erected in the tabernacle, is described in Exodus 27:1-8 . It was a hollow square, 5 cubits in length and in breadth, and 3 cubits in height. It was made of shittim wood, and was overlaid with plates of brass. Its corners were ornamented with "horns" (Exodus 29:12; Leviticus 4:18 ).
In Exodus 27:3 the various utensils appertaining to the altar are enumerated. They were made of brass. (Compare 1 Samuel 2:13,14; Leviticus 16:12; Numbers 16:6,7 .)
In Solomon's temple the altar was of larger dimensions (2 Chronicles 4:1 . Compare 1 Kings 8:22,64; 9:25 ), and was made wholly of brass, covering a structure of stone or earth. This altar was renewed by Asa (2 Chronicles 15:8 ). It was removed by Ahaz (2 Kings 16:14 ), and "cleansed" by Hezekiah, in the latter part of whose reign it was rebuilt. It was finally broken up and carried away by the Babylonians (Jeremiah 52:17 ).
After the return from captivity it was re-erected (Ezra 3:3,6 ) on the same place where it had formerly stood. (Compare 1 Maccabees 4:47 .) When Antiochus Epiphanes pillaged Jerusalem the altar of burnt offering was taken away.
Again the altar was erected by Herod, and remained in its place till the destruction of Jerusalem by the Romans (70 A.D.).
The fire on the altar was not permitted to go out (Leviticus 6:9 ).
In the Mosque of Omar, immediately underneath the great dome, which occupies the site of the old temple, there is a rough projection of the natural rock, of about 60 feet in its extreme length, and 50 in its greatest breadth, and in its highest part about 4 feet above the general pavement. This rock seems to have been left intact when Solomon's temple was built. It was in all probability the site of the altar of burnt offering. Underneath this rock is a cave, which may probably have been the granary of Araunah's threshing-floor (1 Chronicles 21:22 ).
This altar was a small movable table, made of acacia wood overlaid with gold (Exodus 37:25,26 ). It was 1 cubit in length and breadth, and 2 cubits in height.
In Solomon's temple the altar was similar in size, but was made of cedar-wood (1 Kings 6:20; 7:48 ) overlaid with gold. In Ezekiel 41:22 it is called "the altar of wood." (Compare Exodus 30:1-6 .)
In the temple built after the Exile the altar was restored. Antiochus Epiphanes took it away, but it was afterwards restored by Judas Maccabaeus (1 Maccabees 1:23; 4:49 ). Among the trophies carried away by Titus on the destruction of Jerusalem the altar of incense is not found, nor is any mention made of it in Hebrews 9 . It was at this altar Zacharias ministered when an angel appeared to him (Luke 1:11 ). It is the only altar which appears in the heavenly temple (Isaiah 6:6; Revelation 8:3,4 ).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Altar'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/a/altar.html. 1897.