Shabbat

(8) Remember the sabbath day, to keep it holy. (9) Six days shalt thou labour, and do all thy work; (10) but the seventh day is a sabbath unto the LORD thy God, in it thou shalt not do any manner of work, thou, nor thy son, nor thy daughter, nor thy man-servant, nor thy maid-servant, nor thy cattle, nor thy stranger that is within thy gates; (11) for in six days the LORD made heaven and earth, the sea, and all that in them is, and rested on the seventh day; wherefore the LORD blessed the sabbath day, and hallowed it.

(5) [If] one extinguishes the lamp because he is afraid of non-Jews, of bandits, of an evil spirit, or that the sick may sleep, he is exempt; but [if his intention is] to preserve the lamp, to preserve the oil, or to preserve the wick, he is liable. Rabbi Yose exempts in all [these cases] except the [act preserving the wick], because he thereby creates a coal.

(1) If one builds, how much must he build to be liable (i.e. to desecrate Shabbat)? If one builds the smallest quantity, or if one chops stone, or strikes with a hammer, or uses a chisel, or bores a hole - if any of these are done in the smallest quantity, he is liable. This is the principle: If one performs a Melakhah [a constructive activity forbidden on Shabbat and festivals] and that Melakhah endures on the Shabbat, he is liable. Rabbi Shimon ben Gamliel says: One is likewise liable if he strikes a hammer on an anvil because it is like he improves the tool.