 अवध्यतां तपोभिर्यां भवान् समनुपश्यति।आत्मनः सासुरैर्देवैर्हेतुस्तत्राप्ययं महान्।। 
 "You know you will not be killed by asuras or gods. In that case also this keeping Sita with you may be the prime cause of your death. 