ومن باع عينا على أن لا يسلمها إلى رأس الشهر فالبيع فاسد ومن باع جارية إلا حملها فسد البيع
Translation: Selling a specific article on the condition that it not be delivered until a month later is defective; the historical text also invalidates selling an enslaved woman while excluding her pregnancy.
Two distinct issues appear: stipulated non-delivery of the item sold, and an attempted exclusion of an inseparable component in a historical slavery case.
For instance, a specific machine is sold now with a term reserving delivery for a month in the text’s prohibited manner.
The pregnancy example concerns an obsolete historical institution, not any contemporary entitlement to trade in humans.