At/on the altar of something
Definition 1 of 1
Pro Tip 1/3Metaphorical Use
This phrase is used metaphorically to describe a significant sacrifice for a cause or value. 
He laid his ambition at the altar of family harmony.
Pro Tip 2/3Figurative Altar
There is no literal altar involved; it represents an abstract place of sacrifice. 
The project was completed at the altar of sleepless nights.
Pro Tip 3/3Negative Connotation
Often implies regret or loss associated with the sacrifice being made. 
Her health was left at the altar of her career.