Hebrews 11:28:

Through faith he [Moses] kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them.

Notes on Hebrews 11:28:

“He that destroyed the firstborn” is no doubt one of the “evil angels” mentioned in Psalm 78:49-51.  This phrase does not appear refer to God Himself, but rather to an angel (not a demon) whom God permitted to kill Egypt’s firstborn.  God has never subcontracted vengeance to Satan – vengeance is His (Romans 12:19).

If the blood of Jesus kept this evil angel away, the blood of Jesus is surely just as effective today at keeping the devil and his associates from touching you.

See also:

Notes on Psalm 78:49-51
Why Does Exodus 15:25-26 Talk About God Putting Diseases on People?