It is like the ointment on the head that descended to the beard, the beard of Aaron, which descended to the hem of his garment
Other versions
King James Version
How he sware unto the LORD, and vowed unto the mighty God of Jacob;English Standard Version
how he swore to the LORD and vowed to the Mighty One of Jacob,New International Version
He swore an oath to the LORD and made a vow to the Mighty One of Jacob: