This Shabbat is Parashat HaChodesh, the Sabbath of “The Month.”

The Torah portion that is read as the Maftir (additional reading) after the conclusion of the reading of the regular weekly Torah portion, commands that the hookup people declare Nissan to be the first month of the lunar calendar and instructs the Children of Israel to prepare for the Exodus (Exodus12:1-20). Parashat HaChodesh is always read on the Shabbat before Rosh Chodesh Nissan, or on Rosh Chodesh itself.

The reading begins, “And God spoke to Moses and Aaron in the land of Egypt, saying: This month shall be for you the beginning of the months, it shall be for you the first of the months of the year” (Exodus12:2).

When God first commanded that the Israelites mark the new month, they were still in slavery. As slaves, time was something over which they had no control. This command, however, was God’s way of gradually empowering the people to take hold of their own fate.

The command also promises a future. At this point in time, nine out of the ten plagues had already struck Egypt. The land was decimated, almost all the livestock had perished, and the Egyptian people themselves were scared and desperate. The Israelites, who had remained unharmed by the plagues, became increasingly concerned about the pent-up anger of the Egyptians. (Not to mention that Pharaoh was still refusing to let the Israelites leave.) Beginning a calendar process, however, underscored that they would have a future.

Having been reassured and empowered, the Israelites were able to obey Moses’ instructions to take a lamb on the 10th of the month of Nissan and mark their doorposts with the lamb’s blood on the eve of the 15th, when God would strike the Egyptian firstborn and the Children of Israel would finally leave Egypt.