Contradiction with Exodus 31:15
Nehemiah 8:18 describes reading from the law every day, including the Sabbath, while Exodus 31:15 commands rest and no work on the Sabbath, contradicting the daily reading as a form of work.
Exodus 31:15: 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. [holy: Heb. holiness]
Contradiction with Exodus 20:8-10
Nehemiah 8:18 involves daily activities during the festival, while Exodus 20:8-10 emphasizes resting and keeping the Sabbath holy by not engaging in any work, including communal events.
Exodus 20:8-10: Remember the sabbath day, to keep it holy.