Who are the Israelites spared from the final plague?

The Israelites spared from the final plague, which was the death of the firstborn, were those who followed God's instructions to mark their doorposts with the blood of a lamb. This act signified their obedience and faith in God's promise of protection. As a result, the Angel of Death passed over their homes, sparing them from the plague that struck the Egyptians. This event is commemorated in the Jewish holiday of Passover.