Relieve of
Definition 1 of 2
Pro Tip 1/3Positive Relief
Often used when reducing someone's workload or stress positively. 
I'll relieve you of the task so you can focus on recovery.
Pro Tip 2/3Offering Help
Used when offering assistance to take over someone's duties. 
Let me relieve you of that heavy box; you look tired.
Pro Tip 3/3Not Always Voluntary
Sometimes implies duties are taken without the person's preference. 
You've been relieved of your shift due to the schedule change.