Related for Beitzah 64:7

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.