מלכים א, פרק ז׳, פסוק כ״ז

The construction of the ten copper bases in Solomon's Temple is considered a highly complex architectural feat to understand and visualize. These structures formed the physical foundation for the holy washing system used during the Temple service [אברבנאל]. There is a general consensus among commentators that these structures served directly as the bases and resting places for the water basins [מצודת ציון, רד״ק]. The design originated from the early command given to Moses to build a basin along with its base. Because King Solomon constructed ten basins, he consequently built ten matching copper bases to support them [מלבי״ם]. The primary function of these bases was to carry the basins used to transport the water [ביאור שטיינזלץ]. The water held within was essential for purity and cleanliness, used both for washing the hands and feet of the priests and for rinsing the parts of the burnt offerings [רלב״ג, אברבנאל].

When evaluating the size of these structures, the specified length and width do not measure the outer shell of the base. Instead, these dimensions describe its inner space [רלב״ג, אברבנאל]. The height, however, is calculated in different ways. One perspective suggests that the measurement applies only to the main body of the base, entirely excluding the wheels upon which it stood. According to this understanding, the base was designed so that one cubit of its height was square, while half a cubit was round [רש״י]. Conversely, another approach explains that an additional inner base was inserted into each structure, upon which the basin actually rested. In this view, the total given height includes both the outer base and the inserted inner base [מצודת דוד].