Sefer Chasidim Siman 895
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
אם נשפך חלב על הספר אל יחזיר אותו חלב להשליכו לנר:
Sefaria Community Translation
If candle fat dripped on a sefer one should not return it back to the candle.