This Bible contradiction is from the Skeptic's Annotated Bible.

Verses

Yes, they fell to the ground.

Acts 26:14 View context

And when we were all fallen to the earth, I heard a voice speaking unto me, and saying in the Hebrew tongue, Saul, Saul, why persecutest thou me? [it is] hard for thee to kick against the pricks.

No, they remained standing.

Acts 9:7 View context

And the men which journeyed with him stood speechless, hearing a voice, but seeing no man.