A Hexagram, represented by the Star of David, is a Two-Dimensional (Orthographic) projection of a Cube. A Symmetric Projection of the Cube creates a Cross.
One of the many meanings of the first word in the Bible “Bereshit“, is “They (Elohim) created Six” which means that in Six Stages of the Time Cycle the Cube of Space (or the Hexagram) was populated. On the Seventh Day the Center was filled.
The book of Genesis does not describe the creation of the Trinity (They, Elohim, 1+2+3, 1x2x3) itself. This stage was later covered in the Zohar.
The first sentence in Genesis (“In the beginning Elohim created Heaven and Eearth“) contains 7 words and 28 letters. This indicates that the Creation Process was already in the 7th stage of the Tetraktys and in its 2nd Fractal Expansion, the Birth of the Material Universe.
The sum of the entire verse is the 73rd Triangular Number. The prime Numbers 37 and 73 are geometrically related. They form the third and the fourth term in the sequence of Star Numbers (1, 13, 37, 73, 121).
Hexagon/Star pairs are closely related to Triangular numbers. Their product is always a Triangle, and they can be symmetrically generated from a Pair of Triangles.
– About Mystical Number Theory and Pascal’s Triangle, Constable Research, http://hans.wyrdweb.eu/tag/sefer-yetzirah/