Exodus 39:31

And they tied unto it a lace of blue, to fasten it on high upon the mitre; as the LORD commanded Moses.
— Exodus 39:31, King James Version

In other translations

World English Bible (WEB)

They tied to it a lace of blue, to fasten it on the turban above, as Yahweh commanded Moses.

American Standard Version (ASV)

And they tied unto it a lace of blue, to fasten it upon the mitre above; as Jehovah commanded Moses.

Young's Literal Translation (YLT)

and they put on it a ribbon of blue, to put <FI>it<Fi> on the mitre above, as Jehovah hath commanded Moses.