Power to repel evil

The power to repel evil is a recurring force that is found imbued in specific weapons. True to its name, weapons with the power to repel evil cannot be touched by evil beings without causing them great pain, and are additionally able to cut through dark magic. Weapons known to have the power to repel evil include the Master Sword, Four Sword, Light Arrows, and Bow of Light; a similar power seems to exist within the Silver Arrows, Phantom Sword, and Lokomo Sword. The power to repel evil can wane over time, thus needing restored.

The Legend of Zelda: Ocarina of Time
While not specifically referred to as such, the power to repel evil is first hinted at in The Legend of Zelda: Ocarina of Time, where the Master Sword is said to be sacred in a way that prevents evil people from touching it. At the end of the game, it is used to deal the finishing blow against Ganon.

The Legend of Zelda: The Wind Waker
In The Legend of Zelda: The Wind Waker, the power to repel evil is first referred to as such by Ganondorf after Link unsuccessfully tries to attack him with it. Specifically, he says that unless the sword is glowing with that force, it is useless against him, and that its power has waned too much to be effective. To restore the power, Link needs to help Medli and Makar awaken as sages.

The Legend of Zelda: Four Swords Adventures
In The Legend of Zelda: Four Swords Adventures, the power to repel evil within the Four Sword was used to keep Vaati's seal intact. However, over time, he managed to drain it, and by the time Link is forced to pull the sword to fight Shadow Link, the evil-repelling power is gone from it. The now-split Links need to restore the power by collecting Force Gems; once enough are collected, the swords glow, become more powerful, and shoot sword beams. The power needs to be restored to destroy Vaati's locks at the end of each stage, though doing so weakens the sword again for the next one.

The Legend of Zelda: Twilight Princess
In The Legend of Zelda: Twilight Princess, the power to repel evil within the Master Sword is used to dispel the Twilight Shard-borne curse Zant put on Link, locking him in Wolf Link form.

The Legend of Zelda: Skyward Sword
In The Legend of Zelda: Skyward Sword, the power is gradually imbued into the Goddess Sword over the course of the game through the three Sacred Flames, eventually turning it into the Master Sword. Notably, before this is done, Ghirahim is capable of grabbing the sword from Link in their first battle, but he does not try this in later battles.

The Legend of Zelda: Breath of the Wild
In The Legend of Zelda: Breath of the Wild, the power to repel evil shines blue in the Master Sword. Overuse for mundane battles slowly weakens it until the power temporarily disappears, but being close enough to a great enough source of malice, such as one of the Blight Ganons, causes the power to suddenly maximize.