In the biblical context, colors often carry significant symbolic meanings, and blue is frequently associated with the divine, representing the heavenly realm and the presence of God. This symbolism is rooted in various scriptural references and the cultural context of ancient Israel.

Biblical References:

1. The Tabernacle and Priestly Garments:
The use of blue in the construction of the Tabernacle and the garments of the priests is a prominent example of its divine symbolism. In Exodus 25:4, God instructs Moses to collect materials for the Tabernacle, including "blue, purple, and scarlet yarn." These colors were used extensively in the Tabernacle's curtains and the high priest's ephod, breastplate, and robe (Exodus 28:5-6, 31). The use of blue in these sacred items signifies the presence and authority of God among His people.

2. The Tassels on Garments:
In Numbers 15:38-39, the Israelites are commanded to make tassels on the corners of their garments with a blue cord. This blue thread serves as a visual reminder to follow God's commandments and to live a holy life, reflecting the divine nature and authority of God's law: "Speak to the Israelites and tell them to make tassels for the corners of their garments throughout their generations, and to put a blue cord on the tassel at each corner."

3. The Vision of God:
In Ezekiel 1:26, the prophet describes a vision of God seated on a throne that appears like sapphire, a precious blue stone: "Above the expanse over their heads was the likeness of a throne, in appearance like a sapphire stone; and on the throne high above was a figure like that of a man." This imagery reinforces the association of blue with the divine and the heavenly realm.

4. The Sapphire Stone:
The sapphire stone, often associated with the color blue, is mentioned in Exodus 24:10, where the elders of Israel see God, and "under His feet was a work like a pavement made of sapphire, as clear as the sky itself." This description further emphasizes the connection between blue and the divine presence.

Cultural and Symbolic Significance:

In ancient Near Eastern cultures, blue was a rare and valuable color, often derived from lapis lazuli or other precious stones. Its rarity and beauty made it a fitting symbol for the divine. In the biblical narrative, blue's association with the heavens and the divine presence underscores its role as a symbol of God's majesty, purity, and authority.

The use of blue in religious contexts serves as a constant reminder of God's covenant with His people and His omnipresence. It calls believers to a life of holiness and obedience, reflecting the divine nature in their daily lives. Through these scriptural and cultural associations, blue emerges as a powerful symbol of deity in the biblical tradition.Exodus 24:10
And they saw the God of Israel: and there was under his feet as it were a paved work of a sapphire stone, and as it were the body of heaven in his clearness.
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Exodus 25:3,4
And this is the offering which you shall take of them; gold, and silver, and brass,
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Exodus 26:1
Moreover you shall make the tabernacle with ten curtains of fine twined linen, and blue, and purple, and scarlet: with cherubim of cunning work shall you make them.
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Exodus 28:28,37
And they shall bind the breastplate by the rings thereof to the rings of the ephod with a lace of blue, that it may be above the curious girdle of the ephod, and that the breastplate be not loosed from the ephod.
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Exodus 38:18
And the hanging for the gate of the court was needlework, of blue, and purple, and scarlet, and fine twined linen: and twenty cubits was the length, and the height in the breadth was five cubits, answerable to the hangings of the court.
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Exodus 39:1-5,21,24,29,31
And of the blue, and purple, and scarlet, they made cloths of service, to do service in the holy place, and made the holy garments for Aaron; as the LORD commanded Moses.
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Numbers 4:5-12
And when the camp sets forward, Aaron shall come, and his sons, and they shall take down the covering veil, and cover the ark of testimony with it:
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Numbers 15:38-40
Speak to the children of Israel, and bid them that they make them fringes in the borders of their garments throughout their generations, and that they put on the fringe of the borders a ribbon of blue:
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2 Chronicles 2:7,14
Send me now therefore a man cunning to work in gold, and in silver, and in brass, and in iron, and in purple, and crimson, and blue, and that can skill to grave with the cunning men that are with me in Judah and in Jerusalem, whom David my father did provide.
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2 Chronicles 3:14
And he made the veil of blue, and purple, and crimson, and fine linen, and worked cherubim thereon.
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Jeremiah 10:9
Silver spread into plates is brought from Tarshish, and gold from Uphaz, the work of the workman, and of the hands of the founder: blue and purple is their clothing: they are all the work of cunning men.
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Ezekiel 1:26
And above the firmament that was over their heads was the likeness of a throne, as the appearance of a sapphire stone: and on the likeness of the throne was the likeness as the appearance of a man above on it.
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Ezekiel 10:1
Then I looked, and, behold, in the firmament that was above the head of the cherubim there appeared over them as it were a sapphire stone, as the appearance of the likeness of a throne.
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Introduction
... ornamented, apparently, with the "cherubim" embroidered upon it in colors of blue,
purple, and ... is the king among the beasts is an apt symbol for portraying ...
//christianbookshelf.org/pink/why four gospels/introduction.htm

Daily Bread
... darts in swift zigzag a gleam of blue; then, perched ... The cross is the symbol of a
passing experience. ... And so, with song, with autumn colors, with sunset lights ...
//christianbookshelf.org/merriam/the chief end of man/v daily bread.htm

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