Preheat the oven to 375 degrees. Lightly grease a 9x13 inch baking dish.
Heat a large skillet over medium heat. Melt 4 tablespoons of the butter and add the celery, onion and mushrooms. Cook until the vegetables are soft about 10 minutes.
Add the garlic, sage, thyme, and rosemary. Cook for 30 seconds while stirring, then add the remaining 4 tablespoons of the butter. Remove from heat and set aside, allow the butter to melt.
In a large bowl, add the lemon juice and the chicken broth and season with salt and pepper.
Add the bread to the bowl and gently toss to coat. Add the mushroom mixture and mix until evenly combined.
Pour the mixture into the prepared baking dish. Cover with foil and bake for 30-40 minutes. Remove the foil and continue to bake for 5-10 more minutes until the top is golden brown.