Mark 14:44
Now he that betrayed him, had given them a countersign, saying, Whomsoever I shall kiss, that is he, seize him, and lead him off safely.
Matthew 26:48-50
Now he that betrayed him had given them a signal, saying, Whomsoever I shall kiss, that is he: seize him.
Acts 16:23
And laying on them many stripes, cast them into prison, commanding the jailor to keep them in safe custody:
Philippians 1:28
and not dismayed on any occasion by your adversaries; which is indeed the proof of perdition to them, but of salvation to you, and that from God.
2 Thessalonians 3:17
The salutation of Paul with my own hand, which is my sign in every letter: so I write.