The Communion Service
We follow Christ's example of humility—washing one-another's feet—and commemorate His great sacrifice—partaking of the bread and the cup, symbols of His body and blood, which He selflessly offered up, once for all.
Seventh-day Adventists practice open communion, meaning that ALL who profess Jesus Christ as Lord and Savior are welcome to participate.
Related chapters from The Desire of Ages, by Ellen G. White:
Chapter 71—A Servant of Servants
Chapter 72—“In Remembrance of Me”