The title is deliberately ambiguous because I like that kind of thing. Who’s Mohammad’s bitch, Zaynab or Zayd? Zaynab is being treated by these men and by god as chattel. Zayd is being silently pressured or is giving away his wife to ingratiate himself with a man.
This also doesn’t strictly follow the A A B B A rhyming pattern of the limerick. ‘Plow’ is missing the ‘-ed’ but it still seems to register as a rhyme in the mind with ‘Allow’ which is then followed by the ‘-ed’ suffix.
Once again Mohammad is telling the Muslims that Allah commands the thing Mohammad wants.