Exodus 12:22-23

Matthew(i) 22 And take a bunch of ysope, & dyppe it in the bloud that is in the basyn, and strycke it vpon the vpper poste & on the two syde postes, & se that none of you go out at the dore of hys house vntyll the mornyng. 23 For the Lord wyll goo aboute & smyte Egipte. And when he seyth the bloud vpon the vpper door poste & on the two syde postes, he wyl passe ouer the doore, & wyll not suffre the destroyer to come in to youre house to plage you.