Parallel
Exodus 12:13
Brenton's English Septuagint · Berean Standard Bible
And the blood shall be for a sign to you on the houses in which ye are, and I will see the blood, and will protect you, and there shall not be on you the plague of destruction, when I smite in the land of Egypt.
The blood on the houses where you are staying will be a sign; when I see the blood, I will pass over you. No plague will fall on you to destroy you when I strike the land of Egypt.