Ala. Code § 12-21-161

No attorney or his clerk shall be competent or compelled to testify in any court in this state for or against the client as to any matter or thing, knowledge of which may have been acquired from the client, or as to advice or counsel to the client given by virtue of the relation as attorney or given by reason of anticipated employment as attorney unless called to testify by the client, but shall be competent to testify, for or against the client, as to any matter or thing the knowledge of which may have been acquired in any other manner.