Chakra—whose energy connects this world to those beyond—allows Obito to leave Rin's side for a moment and appear in Kakashi’s inner psyche. Obito gives him his Magekyo Sharingan and leaves with a parting wish that Kakashi become the Sixth Hokage.
If either of you die,
you cannot seal me away.
إن مات أحدكما فلن تستطيعوا ختمي
Se uno di voi dovesse morire,
 non potreste più sigillarmi.
Caso um de vocês morra,
não serão capazes de me selar.