Before Srimad-Bhagavatam, no scripture had given the information that anyone had bound the Supreme Lord. Sri Kṛṣṇa is that Supreme Lord. There is no limit to His expanse – inner, outer, upper, lower, downward or sideways. How, then, could a rope, which is itself matter and has limit, bind the unlimited Krsna? That rope was sat-cit-ananda, and especially it was made of the vatsalya-prema of Mother Yasoda. Actually it wasn’t an ordinary rope; it was the rope that Mother Yasoda used to tie her hair. Kṛṣṇa was bound simply by that.