Salt.

Luke 2:13
And suddenly there appeared with the angel a great multitude of the heavenly host, praising God and saying:

but.

Matthew 5:13
You are the salt of the earth. But if the salt loses its savor, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled by men.

Mark 9:49, 50
For everyone will be salted with fire. . . .

Colossians 4:6
Let your speech always be gracious, seasoned with salt, so that you may know how to answer everyone.

Hebrews 2:4-8
and was affirmed by God through signs, wonders, various miracles, and gifts of the Holy Spirit distributed according to His will. . . .