Muhammad bin Abbad bin Ja'far said that al-Muttalib bin Hantab told him that he gave his wife the battah divorce (a final, irrevocable divorce), then came to Umar bin al-Khattab (may Allah be pleased with him) and mentioned it. He asked: What led you to that? He said: I have done it. Then he recited this verse: "And if they had done what they were instructed, it would have been better for them and a firmer establishment" [Surah al-Nisa': 66]. What led you to that? He said: I have done it. He said: Keep your wife, for a single divorce separates her.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الخلع والطلاق / 15007