Torah, Deuteronomy, 33:03 – 33:05: Indeed, You showed love for peoples; all his holy ones are in Your hand, for they let themselves be centered at Your feet, bearing Your utterances. The Torah that Moses commanded us is a legacy for the congregation of Jacob. And He was King in Jeshurun, whenever the sum total of the people were gathered, and the tribes of Israel were together…
It is about uniting all the tribes into one common nation. Each tribe still exists separately according to its internal methodology and nature, and complements others to a complete common vessel. Therefore, although each of them is a perfect part, but perfection is achieved exactly in the connection between them. In this, they become similar to the Creator.
The number 12 comes from the three lines multiplied by the four-letter name of the Creator (HaVaYaH – Yod-Hey-Vav-Hey) in each line. This is why there are 12 tribes.
From KabTV’s “Secrets of the Eternal Book” 2/6/17