"Sacrificial service" refers to the act of selflessly giving one's time, effort, or resources to help or support others, even if it involves personal sacrifice or hardship. Full definition
We have sacrificed the truth of the gospel on the altar of political influence, and have traded the power of sacrificial service in the name of Jesus Christ for the power of being the moral majority and voting in the candidates whom we think will champion our political cause. (redeeminggod.com)
As Dean Willard Sperry has said, «Christianity, thus interpreted, becomes not an added entity outside the major tasks of daily life,... but the sum of all particulars of unselfish and sacrificial service in the day's work, and an experience of actual community of sustaining spirit. (religion-online.org)
It requires an offering of self, just as the marriage relationship requires sacrificial service. (relevantmagazine.com)