Transcribe Spell

When you find a Wizard spell of 1st level, you can copy it into your spellbook. Copying a spell into your spellbook involves reproducing the basic form of the spell, then deciphering the unique system of notation used by the wizard who wrote it. You must practice the spell until you understand the sounds or gestures required, then transcribe it into your spellbook using your own notation. Afterward you can prepare the spell like the other spells in your spellbook. 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the level of spell inwhich you can copy into your spellbook is less than or equal to the level of the spell slot you used.