Sefer Chasidim Siman 854
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.
במוצאי שבת לא יקח עץ ששמו קיה"ן בלשון אשכנ"ז להדליק ולברך עליו מפני שריחו רע ואז צריך ריח טוב להריח כמו שכתוב בספר החשבונות:
Medieval Jewish mysticism, translated by Sholom Alchanan Singer. Northbrook, Ill. Whitehall Co., 1971
On Motzei Shabbat one should not take a piece of wood called "Kihan" in german in order to burn it and recite a blessing on it because its smell is bad whereas one needs something fragrant for this purpose as is written in Sefer Hatshuvot.