New Revised Standard Version
They were startled and terrified, and thought that they were seeing a ghost.

Contemporary English Version
They were frightened and terrified because they thought they were seeing a ghost.

New American Bible
But they were startled and terrified and thought that they were seeing a ghost.

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

But they being troubled and frightened, supposed that they saw a spirit.

Luke 16:30 But he said: No, father Abraham: but if one went to them from the dead, they will do penance.

1 Samuel 28:13 And the king said to her: Fear not: what hast thou seen? and the woman said to Saul: I saw gods ascending out of the earth.

Job 4:14-16 Fear seized upon me, and trembling, and all my bones were affrighted: . . .

Matthew 14:26,27 And they seeing him walking upon the sea, were troubled, saying: It is an apparition. And they cried out for fear. . . .

Mark 6:49,50 But they seeing him walking upon the sea, thought it was an apparition, and they cried out. . . .

Acts 12:15 But they said to her: Thou art mad. But she affirmed that it was so. Then said they: It is his angel.