"'Umar, may Allah be pleased with him, banished Rabi'ah bin Umaiyah to Khaibar for drinking Khamr, and he went and joined Heraclius and became a Christian. 'Umar, may Allah be pleased with him, said: 'I will never expel any Muslim after this.'"
Reference: Sunan an-Nasa'i 5676 In-book : Book 51, Hadith 138 English translation : Vol. 6, Book 51, Hadith 5679
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