"I asked Sa'eed: 'What is the drink that 'Umar bin Al-Khattab, may Allah be pleased with him, regarded as permissible?' He said: 'That which has been cooked until two-third has gone and one-third is left.'"
Reference: Sunan an-Nasa'i 5719 In-book : Book 51, Hadith 181 English translation : Vol. 6, Book 51, Hadith 5722
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