The blood put on the doorposts and the lintel of the houses typifies the redeeming blood of Christ (Matt. 26:28; John 19:34; 1 Pet. 1:18-19). This blood opened the way for the redeemed ones to enter into the houses, implying that the blood of Christ opens the way for us to enter into Christ, who is typified by the house (Heb. 10:19). The same blood closed the way to the destroyer, thereby guarding the redeemed from judgment (v. 23).