From the earliest days of barbecue, the best way to keep smoked meats from drying out was with a mop. A mop is a thin sauce that is applied while smoking. This creates a layering of flavor and helps to prevent the meat from drying out. A good brisket mop should have a bit of acid and oil, like a marinade, and a healthy dose of flavor. With a good brisket mop you might not need a sauce.
Try one or all the Top 10 Brisket Mop Recipes