Havdalah

Essential halachic guidance on blessing requirements and proper Havdalah procedure

Essential laws for the holiest day of the Jewish calendar

One should ensure that the fire used for the blessing is from a candle that "rested." That is, a candle lit before Yom Kippur, or a candle lit from another candle that was burning since before Yom Kippur, which during Yom Kippur itself was forbidden to use for lighting fire.