Exodus 12:24

וּלְקַחְתֶּם אֲגֻדַּת אֵזוֹב וּטְבַלְתֶּם בַּדָּם אֲשֶׁר־בַּסַּף וְהִגַּעְתֶּם אֶל־הַמַּשְׁקוֹף וְאֶל־שְׁתֵּי הַמְּזוּזֹת מִן־הַדָּם אֲשֶׁר בַּסָּף וְאַתֶּם לֹא תֵצְאוּ אִישׁ מִפֶּֽתַח־בֵּיתוֹ עַד־בֹּֽקֶר

And ye shall take a bunch of hyssop, and dip it in the blood that is in the basin, and strike the lintel and the two side-posts with the blood that is in the basin; and none of you shall go out of the door of his house until the morning.

וְעָבַר יְהוָה לִנְגֹּף אֶת־מִצְרַיִם וְרָאָה אֶת־הַדָּם עַל־הַמַּשְׁקוֹף וְעַל שְׁתֵּי הַמְּזוּזֹת וּפָסַח יְהוָה עַל־הַפֶּתַח וְלֹא יִתֵּן הַמַּשְׁחִית לָבֹא אֶל־בָּתֵּיכֶם לִנְגֹּֽף

For the LORD will pass through to smite the Egyptians; and when He seeth the blood upon the lintel, and on the two side-posts, the LORD will pass over the door, and will not suffer the destroyer to come in unto your houses to smite you.

וְהָיָה כִּֽי־תָבֹאוּ אֶל־הָאָרֶץ אֲשֶׁר יִתֵּן יְהוָה לָכֶם כַּאֲשֶׁר דִּבֵּר וּשְׁמַרְתֶּם אֶת־הָעֲבֹדָה הַזֹּֽאת

And it shall come to pass, when ye be come to the land which the LORD will give you, according as He hath promised, that ye shall keep this service.

וְהָיָה כִּֽי־יֹאמְרוּ אֲלֵיכֶם בְּנֵיכֶם מָה הָעֲבֹדָה הַזֹּאת לָכֶֽם

And it shall come to pass, when your children shall say unto you: What mean ye by this service?