Christ several times had informed the disciples about His coming death and resurrection. Here He also indicates that His death will be in substitution for them, dying for their sins.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8