As to the Bahá’í viewpoint on the removal of withholding of life support in medical cases where intervention prolongs life in disabling illnesses, nothing has been found in the Sacred Text specifically on this matter. In such cases decisions must be left to those responsible, including the patients.
(Universal House of Justice, Lights of Guidance, p. 290)
As you have keenly observed, the Universal House of Justice may consider it untimely to make definitive rulings on certain matters to which no direct reference can be found in the Sacred Text. Among these are euthanasia and certain aspects of birth control and abortion, and until such time as rulings are made, these matters are left to the consciences of those concerned who must weigh the medical advice on the case in the light of general guidance given in the Teachings. Your National Spiritual Assembly has specific references regarding birth control and abortion which might be useful to you.
(Universal House of Justice, Lights of Guidance, p. 289)
We have received your letter of March 18, 1974 in which you ask for the Bahá’í viewpoint on euthanasia and on the removal of life support in medical cases where physiological interventions prolong life in disabling illnesses. In general our teachings indicate that God, the Giver of life, can alone dispose of it as He deems best, and we have found nothing in the Sacred Text on these matters specifically but in a letter to an individual written on behalf of the beloved Guardian by his secretary regarding mercy killings, or legalized euthanasia, it is stated: “...this is also a matter which the Universal House of Justice will have to legislate.” Until such time as the Universal House of Justice considers legislation on Euthanasia, decisions in the matters to which you refer must be left to the conscience of those responsible.
(Universal House of Justice, Lights of Guidance, p. 290-291)