The search for "knife" delivered 2 verses in 2 songs on 2 records.
The dragon searched for the following: "knife" as keywords
Here are the matching verses:
Black Sabbath: Dehumanizer
I
On the edge of the blade
But the knife can't cut the hero down
Rainbow: Rising
1. Tarot Woman
Something in the air
Tells me to beware, no, no, no
Her love is like a knife
Should cut away your life
So go, go, go