Why does Sirius Black give Harry a magical knife in "Harry Potter and the Order of the Phoenix"?
To defend himself against Death Eaters and dark magic.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Why does Sirius Black give Harry a magical knife in "Harry Potter and the Order of the Phoenix"? [/INST] To defend himself against Death Eaters and dark magic. </s>