The Holy Sponge is one of the Instruments of the Passion of Jesus. It was dipped in vinegar, most likely posca, a regular beverage of Roman soldiers, and offered to Jesus to drink from during the Crucifixion, according to Matthew 27:48, Mark 15:36, and John 19:29.
James Tissot's depiction. Here, the hyssop stick is used as a kind of straw, and "Stephaton" squeezes the sponge. (c. 1880, gouache over graphite on grey wove paper)
Arma Christi, or the Instruments of the Passion, are the objects associated with the Passion of Jesus Christ in Christian symbolism and art. They are seen as arms in the sense of heraldry, and also as the weapons Christ used to achieve his conquest over Satan. There is a group, at a maximum of about 20 items, which are frequently used in Christian art, especially in the Late Middle Ages. Typically they surround either a cross or a figure of Christ of the Man of Sorrows type, either placed around the composition, or held by angels.
Christ as Man of Sorrows between Four Angels, engraving by Master E. S., c. 1460
The instruments of the Passion. Left to right: the cross of the penitent thief Dismas, ladder, sponge on reed, hammer, angels, Cross of Christ, cock, star, pincers, ladder, spear, cross of the wicked thief Gestas, and two hyssop plants growing from the ground (église Saint-Pierre de Collonges-la-rouge).
The instruments of the Passion (cont). Left to right: chalice, torch, lantern, sword, flagellum, pillar of flagellation, Veronica's veil, 30 pieces of silver, dice, reed sceptre, hand which struck Christ, torch, pitcher of gall and vinegar.
Pietà with Arma Christi, Lorenzo Monaco, 1404
