Q: What does Judaism say about euthanasia?
A: Euthanasia is prohibited. Every moment of a person's life affects an eternal rectification, which we cannot grasp and with which we should not tamper!
When it seems clear that a person is going to pass on, it is important to help him to repent, so that his soul can return to God cleansed of the transgressions that one inevitably commits in this world. It is helpful to recite the Shema Yisrael (Hear O Israel, Hashem is our God, Hashem is One) with or for the sick person. It is also important to sustain every second and spark of a person's life, and to pray to God that He will help us all to return to Him in true repentance