Holy Saturday Orthros (celebrated on the evening of Holy Friday)

The Burial Lamentations, Holy Monastery of Stavronikita, Mount Athos. Mid-16th c.
The Burial of Christ. During Matins, Lamentations (Greek: Επιτάφιος Θρήνος, epitaphios thrênos, lit. "winding-sheet lamentation"; or Εγκομια, enkomia, "praises") are sung before the Epitaphios as at the tomb of Christ, while all hold lighted candles. The verses of these Lamentations are interspersed between the verses of Psalm 118 (the chanting of this psalm forms a major part of the Orthodox funeral service). The psalm is divided into three sections, called stases. At the beginning of each stasis, the priest or deacon will perform a censing. At the third and final stasis, the priest will sprinkle rosewater on the Epitaphios and the congregation, symbolizing the anointing of Christ's body with spices.
Epitaphios prior to Paschal vigil at Christ the Savior Orthodox Church (Chicago, IL)Near the end of Matins, during the Great Doxology a solemn procession with the Epitaphios is held, with bells ringing the funeral toll, commemorating the burial procession of Christ. In Slavic churches, the Epitaphios alone is carried in procession with candles and incense. It may be carried by hand or raised up on poles like a canopy. Many Greek churches, however, will carry the entire bier, with its carved canopy attached. In societies where Byzantine Christianity is traditional, the processions may take extremely long routes through the streets,  with processions from different parishes joining together in a central location. Where this is not possible, the procession goes three times around the outside of the church building. The procession is accompanied by the singing of the Trisagion, typically in a melodic form used at funerals. Those unable to attend the church service will often come out to balconies where the procession passes, holding lit candles and sometimes hand-held censers. In many Greek villages the Epitaphios is also paraded in the cemetery, among the graves, as a covenant of eternal life to those who have passed away.

At the end of the procession, the Epitaphios is brought back to the church. Sometimes, after the clergy carry the Epitaphios in, they will stop just inside the entrance to the church, and hold the Epitaphios above the door, so that all who enter the church will pass under it (symbolically entering into the grave with Christ) and then kiss the Gospel Book. In Greek churches, the Epitaphios is then brought directly to the sanctuary, where it remains on the Holy Table until Ascension Thursday. In Slavic churches, it is brought back to the catafalque in the middle of the church (and honored further with more petals, rosewater and incense), where it remains until the Midnight Office at the Paschal Vigil on Great Saturday night. Where the Epitaphios remains in the center of the church, the faithful will continue to venerate it throughout Great Saturday.

To read more about the Epitaphios, see here.