This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

They should be exiled.

Exodus 31:14 View context

Ye shall keep the sabbath therefore; for it [is] holy unto you: every one that defileth it shall surely be put to death: for whosoever doeth [any] work therein, that soul shall be cut off from among his people.

They should be killed.

Exodus 31:14-15 View context

Ye shall keep the sabbath therefore; for it [is] holy unto you: every one that defileth it shall surely be put to death: for whosoever doeth [any] work therein, that soul shall be cut off from among his people.

Six days may work be done; but in the seventh [is] the sabbath of rest, holy to the LORD: whosoever doeth [any] work in the sabbath day, he shall surely be put to death.

Exodus 35:2 View context

Six days shall work be done, but on the seventh day there shall be to you an holy day, a sabbath of rest to the LORD: whosoever doeth work therein shall be put to death.

Numbers 15:32-36 View context

And while the children of Israel were in the wilderness, they found a man that gathered sticks upon the sabbath day.

And they that found him gathering sticks brought him unto Moses and Aaron, and unto all the congregation.

And they put him in ward, because it was not declared what should be done to him.

And the LORD said unto Moses, The man shall be surely put to death: all the congregation shall stone him with stones without the camp.

And all the congregation brought him without the camp, and stoned him with stones, and he died; as the LORD commanded Moses.