# He has risen from the dead
"He has come back to life"
# from the dead
From among all those who have died. The expression "the dead" describes all dead people together in the underworld. To rise from among them speaks of becoming alive again.
# going ahead of you ... you will see him
Here "you" is plural. It refers to the women and the disciples.
# I have told you
Here "you" is plural and refers to the women.