Is there a current Israeli law to reestablish the Sabbath in Israel?
No, there is not a current Israeli law reestablishing the Sabbath. The context states a law is before the Knesset, Israel's parliament, and has been pending for several months; it would reestablish the Sabbath in every category of Israel and has generated controversy.
Les explains that Sabbath observance will matter because Israel is going back under the law and, if they have the temple, they naturally will once again. He notes reports from the Jerusalem Post that a law has been before the Knesset, Israel's parliament, for several months. That pending law would actually reestablish the Sabbath in every category of Israel, and it has caused a lot of controversy. So the context presents this as a proposed law, not an enacted one.
But pray ye that your flight be not in the winter, neither on the sabbath day: