The inner area of the Temple contained three courts. The easternmost court was the Court of the Women, and it contained the Temple treasury where people donated their money (Mk 12:41-44). Three gates led into this court, one on the north, one on the south, and a third on the east. This third gate on the east side is almost certainly the "Beautiful Gate" that was mention in Acts 3. A fourth gate, which was much larger and ornate led from the Court of the Women west into the Court of Israel (women could proceed no further), which was elevated 15 steps higher than the Court of Women.
The 13 Contribution Chests (Trumpets)
According to the Mishnah (Middoth 2,5) the Women's Court was was just over 200 feet square between bounding lines. Each court on the outside was 60 feet square. The colonnade ran around the court, and within it, against the wall, the thirteen chests, or 'trumpets,' for charitable contributions were placed.
These thirteen chests were narrow at the mouth and wide at the bottom, shaped like trumpets. There were actually eleven treasure chests of the Temple for the voluntary offerings of money, and then also two at the Gate of Susan, for the half-shekel tax.
Their specific objects were carefully marked on them. Nine were for the receipt of what was legally due by worshippers; the other four for strictly voluntary gifts.
According to tradition Edersheim says:
Trumpets 1 and 2 were appropriated to the half-shekel Temple-tribute of the current and of the past year.
Into Trumpet 3 those women who had to bring turtledoves for a burnt and a sin offering dropped their equivalent in money, which was daily taken out and a corresponding number of turtledoves offered. This not only saved the labour of so many separate sacrifices, but spared the modesty of those who might not wish to have the occasion or the circumstances of their offering to be publicly known. Into this trumpet Mary the mother of Jesus must have dropped the value of her offering (Luke 2:22,24) when the aged Simeon took the infant Saviour 'in his arms, and blessed God.'
Trumpet 4 similarly received the value of the offerings of young pigeons.
In Trumpet 5 contributions for the wood used in the Temple;
in Trumpet 6 for the incense, and
in Trumpet 7 for the golden vessels for the ministry were deposited. If a man had put aside a certain sum for a sin-offering, and any money was left over after its purchase, it was cast into Trumpet VIII. Similarly,
Trumpets 9, 10, 11, 12, and 13 were destined for what was left over from trespass-offerings, offerings of birds, the offering of the Nazarite, of the cleansed leper, and voluntary offerings. In all probability this space where the thirteen Trumpets were placed was the 'treasury,' where Jesus taught on that memorable Feast of Tabernacles (John 7 and 8; see specially 8:20). We can also understand how, from the peculiar and known destination of each of these thirteen 'trumpets,' the Lord could distinguish the contributions of the rich who cast in 'of their abundance' from that of the poor widow who of her 'penury' had given 'all the living' that she had (Mark 12:41; Luke 21:1). But there was also a special treasury-chamber, into which at certain times they carried the contents of the thirteen chests; and, besides, what was called 'a chamber of the silent,' where devout persons secretly deposited money, afterwards secretly employed for educating children of the pious poor.
It is probably in ironical allusion to the form and name of these treasure-chests that the Lord, making use of the word 'trumpet,' describes the conduct of those who, in their almsgiving, sought glory from men as 'sounding a trumpet' before them (Matthew 6:2)--that is, carrying before them, as it were, in full display one of these trumpet-shaped alms-boxes (literally called in the Talmud, 'trumpets'), and, as it were, sounding it.
The allusion is all the more pointed, when we bear in mind that each of these trumpets had a mark to tell its special object. It seems strange that this interpretation should not have occurred to any of the commentators, who have always found the allusion such a crux interpretum. An article in the Bible Educator has since substantially adopted this view, adding that trumpets were blown when the alms were collected. But for the latter statement there is no historical authority whatever, and it would contravene the religious spirit of the times.
Edersheim - The musical instruments used by the Levites were deposited in two rooms under the Court of the Israelites, to which the access was from the Court of the Women. Of course the western colonnade of this court was open. Thence fifteen easy steps led through the so-called Gate of Nicanor into the Court of Israel. On these steps the Levites were wont on the Feast of Tabernacles to sing the fifteen 'Psalms of Degrees,' or ascent (Psalms 120 to 134), whence some have derived their name. Here, or, rather, in the Gate of Nicanor, all that was ordered to be done 'before the Lord' took place. There the cleansed leper and the women coming for purification presented themselves to the priests, and there also the 'water of jealousy' was given to the suspected wife. Read More
Edersheim - Court of the Women. The Court of the Women obtained its name, not from its appropriation to the exclusive use of women, but because they were not allowed to proceed farther, except for sacrificial purposes. Indeed, this was probably the common place for worship, the females occupying, according to Jewish tradition, only a raised gallery along three sides of the court. This court covered a space upwards of 200 feet square. All around ran a simple colonnade, and within it, against the wall, the thirteen chests, or 'trumpets,' for charitable contributions were placed.