You can read the Staff of Aesculapius to read spells. (Not specified if this should be possible to fail like a spellbook could, with the same or different effects, or if it depends on whether or not the Staff dislikes you as a non-healer.)

The healing spell is a ray. Monsters will cast it on allies, but they might also hit you. But now that it’s a ray, it’ll bounce off you if you have reflection.

Remove the extra healing, cure blindness, and cure sickness books. The healing spell scales in the amount it heals with skill level. At skilled it also cures blindness, and at expert it cures both blindness and sickness.