Matthew 24:20
But pray ye that your flight be not in the winter, neither on the sabbath day:
Cross-references
Exodus 16:29
Historical context
Exodus 16:29 commands staying in place on the Sabbath — the very restriction that makes flight on a Sabbath difficult here.
Acts 1:12
Historical context
Acts 1:12 defines a Sabbath day's journey from the Mount of Olives — the distance limitation Jesus alludes to for fleeing.