Minato's Dead Demon Consuming Seal!! (ミナトの屍鬼封尽!!, Minato no Shiki Fūjin!!) is chapter 503 of the Naruto manga.
Minato strikes down Tobi with his Rasengan, then teleports to the masked man and releases the Nine-Tails from his control. Acknowledging his defeat, Tobi retreats to a safe distance from the Fourth, but not before stating he will have another chance at world conquest, and then he too, teleported away. Meanwhile, Minato arrives in Konoha and summonsGamabunta to keep the Nine-Tails still while he prepares to teleport it to a safer location. After relocating to a another place, he is unexpectedly met by Kushina Uzumaki and their newborn, who restrains the Nine-Tails using her chakra chains. Asking what she is doing here, Kushina responds to him by stating she intends to use the last of her chakra to pull the fox back to her with her so the it will die with her. Minato prepares to use the seal away the fox, telling Kushina he'll conserve her chakra to give her a chance to see Naruto one last time as the death god hovers ominously over him.