The article called " Hercules and Alcestis: Personal Excellence & Social Duty " says the following.
"In the version popularized by Euripides in his play Alcestis (written c. 438 BCE), however, Hercules plays the pivotal role in bringing Alcestis back from the dead. ...
Hercules is mortified by his behavior and so travels to the underworld where Thanatos is leading Alcestis' spirit toward Persephone's realm. He wrestles death and frees the queen, bringing her back up into the light of day. Hercules then leads her to where Admetus is just returning from her funeral. He tells the king that he must depart on other business and asks him to take care of this lady while he is gone. Admetus refuses because he promised Alcestis that he would never marry again, and it would be unseemly for this woman to reside at the court so soon after his wife's death. Hercules insists, however, and places Alcestis' hand in Admetus'. Admetus lifts the woman's veil and finds it is Alcestis returned from the dead. Hercules tells him that she will not be able to speak for three days, and will remain pale and shadow-like, until she is purified, after which time she will become as she always was."
Notice that Alcestis is said to have had a spiritual resurrection (to have been raised as a spirit) and is said to later to have had physical body again. The scholar James Tabor says that the Christians first believed that Jesus was resurrected as a spirit, but that later Christians believed that the fleshy body of Jesus was also resurrected!
Also notice (in the story at the above mentioned website) that "Alcestis epitomizes the loyal, loving wife who is so devoted to her husband that she would literally die for him." Similarly John 15:13 (NASB) says that Jesus said "This is My commandment, that you love one another, just as I have loved you. Greater love has no one than this, that a person will lay down his life for his friends."