Jñāneśvarī (commentary on the Bhagavadgītā) 1.256

1.256

jaisā nakhāgrīṃ vyāḷu lāge |
to śikhāṃta vyāpī vegeṃ |
tevīṃ ābrahma kuḷa āghaveṃ |
āplavije ||

Just as snake venom striking the tip of a toe-nail / swiftly permeates up to the crown of the head, / so the entire family, right up to its founding ancestor, / is drowned [in ruin].