This Bible contradiction is from the EvilBible.com.
The Sabbath instituted because God rested on the seventh day
Exodus 20:11 View context
For [in] six days the LORD made heaven and earth, the sea, and all that in them [is], and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
The Sabbath instituted because God brought the Israelites out of Ebypt
Deuteronomy 5:15 View context
And remember that thou wast a servant in the land of Egypt, and [that] the LORD thy God brought thee out thence through a mighty hand and by a stretched out arm: therefore the LORD thy God commanded thee to keep the sabbath day.