וַיֹּאמֶר֩ ל֨וֹ אֵלִיָּ֜הוּ שֵֽׁב־נָ֣א פֹ֗ה כִּ֤י יְהוָה֙ שְׁלָחַ֣נִי הַיַּרְדֵּ֔נָה וַיֹּ֕אמֶר חַי־יְהוָ֥ה וְחֵֽי־נַפְשְׁךָ֖ אִם־אֶעֶזְבֶ֑ךָּ וַיֵּלְכ֖וּ שְׁנֵיהֶֽם׃
And Elijah said unto him: ‘Tarry here, I pray thee; for the LORD hath sent me to the Jordan.’ And he said: ‘As the LORD liveth, and as thy soul liveth, I will not leave thee.’ And they two went on.
Read Kabbalistic (mystical) interpretations of II Kings 2:6: Zohar and classical Jewish mystical sources, free online.