hide, scraping the hair off, cutting it, writing two (single) letters (characters), erasing in order to write two letters, building, demolishing (in order to rebuild), kindling, extinguishing (fire), hammering, transferring from one place into another. These are the principal acts of labor—forty less one.
Gemara: For what purpose is the number (so distinctly) given? (They are enumerated.) Said R. Johanan: If one labored through total ignorance of the (laws governing the) Sabbath, he must bring a sin-offering for every act of labor performed.
"Sowing, ploughing." Let us see: Ploughing being always done before sowing, let it be taught first. The Tana (who taught as in the Mishna) is a Palestinian, and in his country they sow first and then plough. Some one taught that sowing, pruning, planting, transplanting, and grafting are all one and the same kind of labor. What would he inform us thereby? That if one performs many acts of labor, all of the same class, he is liable for but one sin-offering.
Said R. Aha in the name of R. Hyya b. Ashi, quoting R. Ami: "One who prunes is guilty of planting, and one who plants, transplants, or grafts is guilty of sowing." Of sowing and not of planting? I mean to say of sowing also.
Said R. Kahana: One who prunes and uses the branches for fuel is liable for two sin-offerings, one for reaping and one for planting. Said R. Joseph: One who mows alfalfa (hay) is guilty of mowing and planting both. Said Abayi: One who mows clover hay (which sheds its seed when mowed) is liable (for a sin-offering) for mowing and sowing.
"Ploughing." There is a Boraitha: Ploughing, digging, furrowing, are one and the same kind of labor. R. Shesheth said: One who removes a knoll of earth in a house becomes liable for building, and if in a field he is liable for ploughing. Rabha said: Filling up a hole in the house makes one liable for building, and in the field for ploughing. R. Aba said: Digging (the same hole) on Sabbath for the purpose of making use of the earth alone is free even according to R. Jehudah, who said that the performance of an unnecessary act of labor makes one culpable. He refers to labor that improves an object and not to that which spoils it.
"Mowing." There is a Boraitha: Reaping, vintaging, selecting dates, olives, and figs are all one and the same kind of labor.
