The demon Aghasura appeared before Krishna and His friends. Aghasura happened to be the younger brother of Putana and Bakasura, and he thought, "Krishna has killed my brother and sister. Now I shall kill Him along with all His friends and calves." KB 1 12
KRISHNA THE SUPREME PERSONALITY OF GODHEAD (1970) AC BHAKTIVEDANTA SWAMI PRABHUPADA
http://www.krishnapath.org/free-ebooks-audiobooks-of-srila-prabhupada/krsna-book/
