Related על ביצה 4:4

Nobody should put a stone on a log to break it; but he may stick it in the sand to break it. One may not make charcoals on the holiday, not even for the same day itself.

Three things were said about the wick, three about the aggravation and three about the lenient. These are the three that were said about the aggravation: one must not first make it; one must not singe it by the fire, and it must not be cut in two. And these are the three that were said about the lenient: it may be soaked in oil, it may be flattened with the hand, and one may divide it by fire into two lamps.