Encourage them to be nice to each other. Only one person should talk, so the rabbits won't get confused. Speak loudly and clearly if they begin to fight. Clap your hands loudly. You can separate them with your hands if you're wearing heavy gloves for protection from bites.
Rabbits have very sharp teeth and their bites can draw blood.
Continue for 10 to 15 minutes. Stop immediately if the rabbits fight viciously. Repeat this bonding process for about 10 or 15 minutes every day, until they begin to groom each other almost immediately when placed together. Then continue for a few more days. Place the grooming rabbits in a neutral cage or play area.