Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Prophet (peace and blessings be upon him) said: "He is not one of us who has relations with a pregnant woman."
Ahmad recorded it within a long hadith, and al-Tabarani also recorded it. Its chain contains al-Hajjaj bin Artat, who is a mudallis (one who conceals defects in the chain), and the rest of its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب النكاح / 7600
Hadith Gradingمحدثین:إسناده ضعیف
Hadith Takhrij«اخرجه الطبراني فى المعجم الكبير (12090) اخرجه احمد فى المسند (2318) ، أخرجه المعجم الكبير للطبراني برقم: 12090»