Moses recorded for us, in Exodus, Chapter 12, one of the most amazing moments in human history. Pharaoh had refused to let Israel go after 430 years in bondage. But God came with a series of judgments to show Pharaoh and the whole nation and the Israelites that there was only one true God. A God who should be bowed down to and served.
A final judgment came in one night as God took every firstborn son from the Egyptians households in death. But among the 1 million+ Israelites, not a single child died.