# sheath

the cover for a knife or sword that keeps the knife or sword from cutting the owner

# Should I not drink the cup that the Father has given me?

"I must surely drink the cup that the Father has given to me!" 

# the cup

Here "cup" refers to the suffering that Jesus must endure.

# Father

This refers to God the Father. It is best to translate “Father” with the same word that your language uses to refer to a human father.