Berean Study Bible
But they were startled and frightened, thinking they had seen a spirit.

King James Bible
But they were terrified and affrighted, and supposed that they had seen a spirit.

American Standard Version
But they were terrified and affrighted, and supposed that they beheld a spirit.

Darby Bible Translation
But they, being confounded and being frightened, supposed they beheld a spirit.

Douay-Rheims Bible
But they being troubled and frightened, supposed that they saw a spirit.

English Revised Version
But they were terrified and affrighted, and supposed that they beheld a spirit.

Young's Literal Translation
and being amazed, and becoming affrighted, they were thinking themselves to see a spirit.