Malachi 3
See, I am sending my messenger to prepare the way before me, and the Lord whom you seek will suddenly come into his temple. The messenger of the covenant, in whom you delight — indeed he is coming, says the Lord of hosts.
2 But who can endure the day of his coming, and who can stand when he appears?
For he is like a refiner's fire and like fullers' soap;
3 he will sit as a refiner and purifier of silver, and he will purify the descendants of Levi and refine them like gold and silver, until they present offerings to the Lord in righteousness.
And may Christ, the Son of righteousness
Shine upon you
and scatter the darkness from your path
blessing from Lutheran Vespers at church of St Anne and St Agnes, London
https://www.bbc.co.uk/radio3/abachchristmas/pip/eahjx/