"You shall make a plate of pure gold and engrave on it, like the engraving of a signet, ‘Holy to the Lord.’ And you shall fasten it on the turban by a cord of blue. It shall be on the front of the turban. It shall be on Aaron's forehead" (Ex 28:36-38a NIV)
These commandments that I give you today are to be upon your hearts. Impress them on your children. Talk about them when you sit at home and when you walk along the road, when you lie down and when you get up. Tie them as symbols on your hands and bind them on your foreheads. (Dt 6:6-8)
The Lord said to Moses, “Speak to the people of Israel, and tell them to make tassels on the corners of their garments throughout their generations, and to put a cord of blue on the tassel of each corner. And it shall be a tassel for you to look at and remember all the commandments of the Lord, to do them, not to follow after your own heart and your own eyes, which you are inclined to whore after. So you shall remember and do all my commandments, and be holy to your God. (Nu 15:37-40)
I promised to post on the connection between the word of God and the colour blue. Here it is.
Aaron was to have a plate bound to his forehead by a cord of blue. It had the word of God - "Holy to the Lord" engraved upon it. In a parallel analogy, the Lord commanded the people through Moses to have the word of God bound upon their foreheads.
The blue cord appears again in the curious commandment about the tassels. Here the blue chord and the tassel were again to remind them of all that the Lord had spoken to them, that they would obey it and be holy to the Lord.
Slightly more tenuously, perhaps, a blue cord is reminiscent of a river. When God speaks it is often described like the "roar of many waters." This takes us back to the four rivers that flowed out of Eden. There is more to be said here too, which I will write in another post.
[Again, just to stress: this is not meant to be taken as a rigorous theological basis for the meaning of the colour blue in the scriptures , but I trust it does lend weight to my association of this colour with the revealed word of God.]