The indefinite article is an artefact of translation. The original can as well be translated with "the wife ". The Qur'an is the only reliable source, and doesn't mention multiple wives. The tellings from the Christian tradition are all not considered reliable by any scholars, neither Islamic nor Christian.

The indefinite article is an artefact of translation. The original can as well be translated with "the wife ". The Qur'an is the only reliable source, and doesn't mention multiple wives. The tellings from the Christian tradition are all not considered reliable by any scholars, neither Islamic nor Christian. The unreliable source mentions a female servant to the wife.