“Tabari” and “Abu al-Faraj Isfahani” write in this regard...

“Tabari” and “Abu al-Faraj Isfahani” write in this regard: فلما بلغ قتلهم عمر بن الخطاب تكلم فيه عند أبي بكر فأكثر وقال عدو الله عدي علي امرئ مسلم فقتله ثم نزا علي امرأته وأقبل خالد بن الوليد قافلا حتي دخل المسجد وعليه قباء له عليه صدأ الحديد معتجرا بعمامة له قد غرز في عمامته أسهما فلما أن دخل المسجد قام إليه عمر فانتزع الأسهم من رأسه فحطمها ثم قال أرثاء قتلت امرأ مسلما ثم نزوت علي امرأته والله لأرجمنك بأحجارك When “Umar ibn Khattab” was told that “Nuwayrah” has been killed by “Khalid”, he told “Abu-Bakr” about this incident and said: enemy of god has killed a Muslim and slept with his wife!!!

“Khalid ibn Walid” came to mosque, “Umar ibn Khattab” told him: you killed a Muslim man and slept with his wife. Swear to god! I’ll stone you by the stone you made (4) Al-Dhahabi says: فلما قدم خالد قال عمر: يا عدو الله قتلت امرأً مسلماً ثم نزوت علي امرأته When “Khalid” arrived at “Medina”, “Umar,” told him: O enemy of God! You killed a Muslim male and slept with his wife!

(5) But as for this question that why “Abu-Bakr” didn’t enforce divine punishment and defended Khalid ibn Walid’s crimes, Sunni scholars say responding this question: because “Abu-Bakr” knew “Khalid” a “Mujtahid”, that’s why he didn’t punish him.

“Ibn Khallikan” and other Sunni scholars have written: ولما بلغ الخبر أبا بكر وعمر رضي الله عنهما قال عمر لأبي بكر رضي الله عنه إن خالدا قد زني فارجمه قال ما كنت لأرجمه فإنه تأول فأخطأ When Abu-Bakr and Umar were notified, Umar told Abu-Bakr: Khalid has committed adultery, you should stone him! Abu-Bakr said: I won’t do so; because he’s done Ijtihad and made mistake in his Ijtihad!!!