This excerpt is taken from the book of Sheikh Ghulam Mustafa Zaheer Amanpuri Hafizahullah Difa-e-Sahaba Radi Allahu Anhum.
Lāwalā Mu'ādhun Lahalaka ʿUmaru
جاء رجل إلى عمر بن الخطاب رضى الله عنه فقال: يا أمير المؤمنين إني غبت عن امرأتي سنتين فجئت وهى حبلى فشاور عمر رضى الله عنه ناسا فى رجمها، فقال معاذ بن جبل رضي الله عنه: يا أمير المؤمنين إن كان لك عليها سبيل فليس لك على ما فى بطنها سبيل فاتركها حتى تضع، فتركها فولدت غلاما قد خرجت ثناياه فعرف الرجل الشبه فيه فقال: ابني ورب الكعبة، فقال عمر رضي الله عنه : عجزت النساء أن يلدن مثل معاذ، لولا معاذ لهلك عمر.
A man came to Sayyiduna Umar ibn Khattab (may Allah be pleased with him) and said: Commander of the Faithful! I was away from my wife for two years, and I have just returned, and she is pregnant. Sayyiduna Umar (may Allah be pleased with him) consulted the people about stoning her to death. Sayyiduna Muadh ibn Jabal (may Allah be pleased with him) said: You may stone the mother, but the child does not have the right to be stoned! Therefore, postpone the matter until delivery. So they left her. The woman gave birth, and the child's front teeth had already come out. When the man saw the resemblance of the child to himself, he said: By the Lord of the Kaaba, this child is mine. Sayyiduna Umar ibn Khattab (may Allah be pleased with him) said: After Muadh ibn Jabal (may Allah be pleased with him), mothers became barren; if it were not for Muadh, Umar would have been destroyed.
Reference: (Sunan Saeed bin Mansoor: 2076, Musannaf Ibn Abi Shaybah: 543/5, Musannaf Abdul Razzaq: 354/7 H: 13454, Sunan al-Daraqutni: 3876, Al-Sunan al-Kubra by Al-Bayhaqi: 443/7, Tarikh Ibn Asakir: 488/58)
The chain of narration is very weak.
A’mash is "Mudallis" (one who conceals the source), did not clarify the hearing.
"Ashyaakh Muna" are ambiguous and unknown.
In Ibn Asakir, there is no connection to "Ashyaakh Muna". Abu Sufyan (may Allah have mercy on him) did not live in the time of Sayyiduna Umar (may Allah be pleased with him).
