'Twelve' in the Bible

‘Return, O faithless children [of the twelve tribes],’ says the Lord,‘For I am a master and husband to you,And I will take you [not as a nation, but individually]—one from a city and two from a [tribal] family—And I will bring you to Zion.’

The two pillars, one sea, and twelve brasen bulls that were under the bases, which king Solomon had made in the house of the LORD: the brass of all these vessels was without weight.

And concerning the pillars, the height of one pillar was eighteen cubits; and a fillet of twelve cubits did compass it; and the thickness thereof was four fingers: it was hollow.