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:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
If candle fat dripped on a sefer one should not return it back to the candle.