The Prophet ﷺ said, "The slaughter of the fetus is accomplished through the slaughter of its mother."
حدثنا أبو عبيدة حدثنا يونس بن أبي إسحاق عن مجالد عن أبي الوداك جبر بن نوف
عن النبي ﷺ قال ذكاة الجنين ذكاة أمه
No references are available.
Its isnad is sahih. The hadith has already appeared at 11199. Abu Ubayda, the teacher of Ahmad, is Ibn Ubaydullah bin Abdul-Rahman al-Ashjai, maqbul.