Answer:
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
I can be repeated but rarely in the same way. I can't be changed but can be rewritten. I can be passed down but should not be forgotten.
The time between daylight and darkness when blood drinkers like to come out
I taste better than I smell. What am I?
What has an eye but cannot see?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.