Rashtriya Swayamsevak Sangh (RSS) chief Mohan Bhagwat on Wednesday asked the Hindus to take a pledge to ensure 'ghar wapsi' of their brethren who had "converted", and made a renewed clamor for the Shreekrishna Janmabhoomi at Mathura. Bhagwat was speaking at 'Hindu Mahakumbh', which began at Chitrakoot on Tuesday.