asphalōs

(Translation from NRSV with a few modifications for a more literal meaning)

Mark

14: 44

Now the betrayer had given them a sign, saying, "The one I will kiss is the man; arrest him and lead him away safely (asphalōs)."

Acts

2: 36	Therefore let the entire house of Israel know safely (asphalōs) that God has made him both Lord and Messiah, this Jesus whom you crucified."
16: 23	After they had given them a severe flogging, they threw them into prison and ordered the jailer to keep them safely (asphalōs).