Find commit that referenced a blob first

Hi,

I have a blob hash and I would like to know what commit referenced this blob first in a given Git repo.

I could iterate through all commits sorted by date (or generation number) and then recursively search in the referenced trees until I find my blob. I wonder, is this the most efficient way to solve my problem? Is there some trick/existing Git command that would perform this search more efficiently for large repos?

Thank you, Lars