# Be on your guard

"Be ready for what people will do to you"

# will give you over to councils

"take you and put you under the control of councils"

# you will be beaten

"people will beat you" 

# You will stand before

"You will be put on trial before" or "You will be brought to trial and judged by" 

# for my sake

"because of me" or "on account of me"

# as a testimony to them

"and testify to them about me" or "and you will tell them about me"