Reference: Treasury
Easton
(Mt 27:6; Mr 12:41; Joh 8:20). It does not appear that there was a separate building so called. The name was given to the thirteen brazen chests, called "trumpets," from the form of the opening into which the offerings of the temple worshippers were put. These stood in the outer "court of the women." "Nine chests were for the appointed money-tribute and for the sacrifice-tribute, i.e., money-gifts instead of the sacrifices; four chests for freewill-offerings for wood, incense, temple decoration, and burnt-offerings" (Lightfoot's Hor. Heb).
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Morish
A part of the temple was called 'the treasury,' in which were kept things consecrated to Jehovah, as the gold, silver, and vessels of brass and iron captured from Jericho. Jos 6:19. The free-will offerings of the people were also given in at 'the treasury.' Mr 12:41,43. On one occasion the Lord spoke to the people 'in the treasury, as He taught in the temple,' doubtless in the outer part where He could watch the people bringing in their gifts. Lu 21:1; Joh 8:20.
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Smith
Treasury,
Mr 12:41; Lu 21:1
a name given by the rabbins to thirteen chests in the temple, called trumpets from their shape. They stood in the court of the women. It would seem probable that this court was sometimes itself called "the treasury" because it contained these repositories.