Wise men
For Zelda II The Adventure of Link on the Nintendo Entertainment System (NES).
Every town has a wise man who teaches Link one spell. He waits in a house until Link has enough magic containers, and most towns ask for something first.
Official art
From the official guides
There are people in town who would like to teach you magic. Depending on the kind of magic, there are also times when they will not teach you if you have not got enough MAGIC point containers or satisfied certain conditions. You'll be able to learn at least one magic trick per town.
Every town has someone who will teach you magic. For some kinds of magic, they won't teach you unless you have enough MAGIC containers or meet a certain condition, but you can always learn one spell in each town.
From a wise man in the town, he may learn a secret of magic power.
Good magicians who teach Link magic. There are eight of them in Hyrule.
What they say
Teaching the spell in Rauru
IN PARAPA DESERT USE THIS MAGIC TO SURVIVE
After in Rauru, Ruto, Saria, and Mido
I CANNOT HELP YOU ANYMORE. GO NOW.
Teaching the spell in Ruto
WITH THIS YOU CAN JUMP VERY HIGH.
Teaching the spell in Saria
USE THIS MAGIC TO RESTORE YOUR LIFE.
Teaching the spell in Mido
THIS MAGIC WORD WILL GIVE YOU POWER.
Too few containers in Nabooru, Darunia, and New Kasuto
COME BACK WHEN YOU ARE READY.
Teaching the spell in Nabooru
THIS MAGIC WILL MAKE YOUR SWORD SHOOT FIRE
After in Nabooru, Darunia, New Kasuto, and Old Kasuto
YOU KNOW ALL I CAN TEACH YOU. GO.
Teaching the spell in Darunia
THIS MAGIC WILL STRENGTHEN A SHIELD.
Teaching the spell in New Kasuto
REMEMBER THE MAGIC WORD.
Too few containers in Old Kasuto
THE TOWN IS DEAD. LOOK EAST IN WOODS.
Teaching the spell in Old Kasuto
I CAN GIVE YOU MOST POWERFUL MAGIC.