Umar banished Rabia bin Umaya to Khaybar for drinking wine, but he fled to Heraclius and converted to Christianity. Umar
then said, "I will never again banish a Muslim after this."
أخبرنا زكريا بن يحيى قال حدثنا عبد الأعلى بن حماد قال حدثنا معتمر بن سليمان قال حدثني عبد الرزاق عن معمر عن الزهري
غرب عمر رضي الله عنه ربيعة بن أمية في الخمر إلى خيبر فلحق بهرقل فتنصر فقال عمر رضي الله عنه لا أغرب بعده مسلما
No references are available.
Its isnad is daif. It is found in Sunan al-Kubra, hadith 5186, and Musannaf of Abdul-Razzaq, 9/230, 231, hadith 17040. Zuhri narrated with an, indicating a possible break in the chain. It has a corroborating witness reported by Abdul-Razzaq, 7/311, hadith 13320, though its chain is daif, 7/314, and disconnected.