Southern Cornbread and Oyster Dressing

1/4 cup butter
1 large onion, chopped
4 scallions, chopped
2 stalks celery, chopped
3 cups crumbled cornbread
3 cups soft bread crumbs
1/2 cup chopped fresh parsley
Salt and pepper, to taste
2 large eggs, lightly beaten
1 pint shucked oysters, drained
1/2 cup oyster liquid, from drained oysters

Preheat oven to 350 degrees F.

Saut