"Krishna became a householder (head of a household) in Dvaraka and married many wives, and had many sons and grandsons. In the race of the Yadus, no one was poor; everyone had many children, lived a long life, and respected Brahmins. But they were so numerous that one could not count them even in a hundred years. The terrible demons who had been slain in the battle of the gods and demons were born among men, and so at the command of Visnu the gods became incarnate in the race of Yadus to repress the demons.... When Krsna had killed the demons, and thus relieved the burden of the earth, he thought, 'The earth is still overburdened by the unbearably burdensome race of the Yadus. No one else can overcome them, since they are under my protection.' ... Deluded by Krsna's power of delusion, and cursed by the Brahmins, they were all destroyed, and when his entire family had been destroyed, Krsna said, 'The burden has been removed.' " -- Srimad Bhagavatam 10:90:27-44; 11:1:1-4; 11:30:1-25.
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