the blood
Exodus 12:23
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.
Genesis 17:11
And ye shall circumcise the flesh of your foreskin; and it shall be a token of the covenant betwixt me and you.
Joshua 2:12
Now therefore, I pray you, swear unto me by the LORD, since I have shewed you kindness, that ye will also shew kindness unto my father's house, and give me a true token:
Hebrews 11:28
Through faith he kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them.
and when
1 Thessalonians 1:10
And to wait for his Son from heaven, whom he raised from the dead, even Jesus, which delivered 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 one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.