ANSWER - Clean the jars with hot soapy water, rinse thoroughly, and allow them to completely air dry. You do not have to boil them or use a chemical disinfectant. Pure honey keeps best in air-tight containers in a dry place at room temperature (70°F to 80°F). An air-tight cover is necessary because honey loses aroma and flavor and absorbs moisture and odors when exposed to air. Normally honey is low enough in water that no microorganisms can grow. But if moisture gets into it, it can dilute it and set up the right conditions for the growth of yeasts and molds. Honey that foams and smells like alcohol is spoiled and should be discarded.
Honey may crystallize or granulate as it gets older, or if it is refrigerated or frozen. This is a natural process and does not harm the honey in any way. To return crystallized honey to liquid form, place the open container of honey in a pan of hot (not boiling) water until crystals disappear. You can also do this to make filling into jars easier. Be careful not to overheat because too much heat causes honey to change color and flavor.