SQL - Sum field based on two earliest dates

Hello,

Is there a generic way to sum up a field based on the two earliest dates?

"Table" consists of the following columns:

1) Date

2) VisitorID

3) Revenue

Basically, for each unique Visitor ID, I want to provide the sum of Revenue for the two earliest dates in the table.

Is there a quick way to calculate this? Most online solutions only look at the earliest date, and not the two earliest.

Thank you in advance!