'Acquainted' in the Bible

Simon Peter and another disciple followed them as they brought Jesus to Annas. (Now the other disciple was acquainted with the high priest, and he went with Jesus into the high priest's courtyard.)

But Simon Peter was left standing outside by the door. So the other disciple who was acquainted with the high priest came out and spoke to the slave girl who watched the door, and brought Peter inside.

But the evil spirit replied to them, "I know about Jesus and I am acquainted with Paul, but who are you?"