If your [customer number] field is text then this --
SELECT [customer number], [customer name], [invoice amount], [paid]
FROM YourTable
WHERE [customer number] = "107" OR [customer number] = "122";
If your [customer number] field is a number datatype then this --
SELECT [customer number], [customer name], [invoice amount], [paid]
FROM YourTable
WHERE [customer number] = 107 OR [customer number] = 122;