Reading from the Synaxarion:

Guria, Shamuna, and Habib, Martyrs and Confessors of Edessa

Of these most illustrious Martyrs of the city of Edessa in Syria, Guria and Shamuna contested during the reign of Diocletian, in 288; after many tortures, they were cast into prison, then beheaded. Saint Habib, a deacon, contested in the days of Licinius, in the year 316, and was burned alive; he was buried with Saints Guria and Shamuna. The three have one common feast, and it is always together that they are portrayed in icons and invoked by the faithful. On account of a renowned miracle they worked, they are invoked for help in marital difficulties.

A certain Goth had come with the Roman army to Edessa and was quartered in the house of a pious widow named Sophia. The Goth asked Sophia for the hand of her daughter, Euphemia; after resisting for a long time, Sophia at last agreed. When it was time for the army to return home, Sophia made the Goth vow by the power in the holy Martyrs Shamuna, Guria, and Habib, to keep Euphemia as the apple of his eye. As he was nearing his home, however, the treacherous man revealed to Euphemia that he already had a wife. Euphemia was compelled to serve the Goths wife, who dealt with her mercilessly. After extreme sufferings, which included being sealed alive in a tomb and left there to die, Euphemia was miraculously conveyed to Edessa, to the very shrine of the holy Martyrs whose surety they had taken, and was reunited with her mother through their holy prayers.