Exodus 12:13
The blood shall be a sign for you, on the houses where you are. And when I see the blood, I will pass over you, and no plague will befall you to destroy you, when I strike the land of Egypt.
Hebrews 11:28
By faith he kept the Passover and sprinkled the blood, so that the Destroyer of the firstborn might not touch them.
Genesis 17:11
You shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between me and you.
Exodus 12:23
For the LORD will pass through to strike the Egyptians, and when he sees the blood on the lintel and on the two doorposts, the LORD will pass over the door and will not allow the destroyer to enter your houses to strike you.
Joshua 2:12
Now then, please swear to me by the LORD that, as I have dealt kindly with you, you also will deal kindly with my father's house, and give me a sure sign
1 Thessalonians 1:10
and to wait for his Son from heaven, whom he raised from the dead, Jesus who delivers us from the wrath to come.
1 John 1:7
But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.