With the three pendants in hand, you now hold the keys to removing the Master Sword from its pedestal, deep within the Lost Woods.

Go to the Lost Woods

Go west from the Tower of Hera, past Spectacle Rock, and you can go south to jump down from the ledge. From there, go west, and you can either climb down the ladder or jump down from the ledge to the left or right of the ladder. Then enter the cave at the base of the ladder.

The path here is straightforward, so just go through until you reach a door. Go through the door, then follow the path southwest to reach the door to the outside. Go through.

Jump down from the ledge, then go north to the next area. Go northwest from the lumberjacks to enter the Lost Woods.

The Lost Woods

Go west, then go south through the log. Then go west and north, and you can cut through two bushes to reach another log going north. Go through that log. Continue on, and the path will split. Go northwest at the split and go through the log to the north to reach a new area.

Go north and you will find the pedestal of the Master Sword. Go to the north side of the sword, then face the sword and press A to pull it from the pedestal. If you have all three pendants, you will obtain the Master Sword. Each time you swing the Master Sword when your hearts are full, you will shoot a beam of energy.

Receive a Message

You will receive a message from Sahasrahla. Afterward, go south to return to the previous area. Go south and you will receive a message from Zelda.

Optional: Go to the Sanctuary

You can optionally go to the Sanctuary. To get there from where you heard Zelda's message, go east, and when you reach the two long logs that are side-by-side, go north through the eastern log. From there, go east to reach the Lumberjacks' house. Go south from there until you reach the pond with the whirlpool in it, then go east from there to reach the Sanctuary. Go inside and talk to the priest.

Go to the Castle

Your next destination is Hyrule Castle to confront the wizard. If you went to the Sanctuary, you can go west, then south, then east to reach the castle. If not, to get there from where you heard Zelda's message, go east, and when you reach the two long logs that are side-by-side, go north through the eastern log. From there, go east to reach the Lumberjacks' house. Go south from there until you reach the pond with the whirlpool in it, then go south again, then east.