Exodus 39:31 in the World English Bible
They tied to it a lace of blue, to fasten it on the turban above, as the LORD commanded Moses.
Context
30 And they made the plate of the holy crown of pure gold, and wrote upon it a writing, like to the engravings of a signet, HOLINESS TO THE LORD.
31 And they tied unto it a lace of blue, to fasten it on high upon the mitre; as the LORD commanded Moses.
32 Thus was all the work of the tabernacle of the tent of the congregation finished: and the children of Israel did according to all that the LORD commanded Moses, so did they.