Berean Study Bible
But Peter kept on knocking, and when they opened the door and saw him, they were astounded.

King James Bible
But Peter continued knocking: and when they had opened the door, and saw him, they were astonished.

American Standard Version
But Peter continued knocking: and when they had opened, they saw him, and were amazed.

Darby Bible Translation
But Peter continued knocking: and having opened, they saw him and were astonished.

Douay-Rheims Bible
But Peter continued knocking. And when they had opened, they saw him, and were astonished.

English Revised Version
But Peter continued knocking: and when they had opened, they saw him, and were amazed.

Young's Literal Translation
and Peter was continuing knocking, and having opened, they saw him, and were astonished,