You can control class loading in the jboss-deployment-structure.xml. It should look something like this (please read the docs of your jboss version about the exact configuration parameters):

<jboss-deployment-structure xmlns="urn:jboss:deployment-structure:1.2" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <deployment>
        <exclusions>
            <module name="org.hibernate" slot="main" />
        </exclusions>
        <dependencies>
            <module name="org.hibernate" slot="5.1.10.Final" />
        </dependencies>
    </deployment>
</jboss-deployment-structure>

You may also need to add the following property in the persistence.xml:

<property name="jboss.as.jpa.providerModule" value="org.hibernate:5.1.10.Final"/>

Also, create a new module and copy the necessary jars for the Hibernate version you want to use; here are more details about class loading in AS7.