Mark 16:13

And they went away and told it to the rest: neither believed they them.

Luke recounted in detail how these two returned to Jerusalem and reported to the eleven as they were gathered together; and, although Luke did not mention the fact of the eleven's unbelief of their report, he did relate how Christ suddenly appeared in the midst of them for the express purpose of causing them to believe. Thus, the sacred records sustain and corroborate each other (Luke 24:33-35).

Neither believed they them ... From the Lucan account, it is clear that the "eleven" were the ones who did not at first believe. In the verses following this, one of the most fantastic exhibitions of the use of pronouns to be found anywhere in all literature is in evidence; and the pronouns are the key to the next passage.