Pure Betrayal and a Fleeting Plea

is episode 138 of the original Naruto anime.

Synopsis
When Sasame drugs Naruto, Sakura and Jiraiya, she prepares to let them be given to Orochimaru in order for her to be led to Arashi. But, when she discovers that they were planning to be killed, she begs the ones about to do so to stop. Naruto reveals that he and the others faked being put to sleep, and attack. Kagerō attacks Naruto and Jiraiya with a powerful technique that shortens her life, then escapes with Jigumo and Kamikiri. When Jigumo and Kamikiri discover that they were being used by Orochimaru, they attack him, but are apparently killed.