Matsya Purana 50.44

50.44

yaṃ yaṃ karābhyāṃ spṛśati jīrṇaṃ rogiṇameva ca.
punaryuvā ca bhavati tasmāttaṃ śantanuṃ viduḥ.. 50.43 ..

King Śantanu was a very learned physician, and was highly accomplished. It is laid down in the books on medicine that by his mere touch even the patient suffering from a most dreadful disease would be instantly cured and become young. He was for that reason known as Śantanu. He married the sacred Ganges.—42-44.