How should they be punished? (Jer 9:7-9:9)

“Therefore thus says Yahweh of hosts.

‘I will now refine them.

I will test them.

What else can I do

With my sinful people?

Their tongue is a deadly arrow.

It speaks deceit

Through the mouth.

They all speak friendly words

To their neighbors.

But inwardly

They are planning

To lay an ambush.

Shall I not punish them

For these things?

Shall I not bring retribution

On a nation such as this?’

Says Yahweh.”

Yahweh wants to test or refine this sinful people. Their tongues are like deadly arrows because of their deceit. They speak friendly words to their neighbors, but they are planning an ambush for them. How are they to be punished? How much retribution should be handed out to such a people and a country?