Slow Cooker Lentil and Ham Soup

INGREDIENTS

• 1 cup dried lentils
• 1 cup chopped celery
• 1 cup chopped carrots
• 1 cup chopped onion
• 2 cloves garlic, minced
• 1 1/2 cups diced cooked ham
• 1/2 teaspoon dried basil
• 1/4 teaspoon dried thyme
• 1/2 teaspoon dried oregano
• 1 bay leaf
• 1/4 teaspoon black pepper
• 32 ounces chicken broth
• 1 cup water
• 8 teaspoons tomato sauce