“We, the family of Muhammad (ﷺ), would stay for a month during which no fire would be lit (for cooking) and we had only dates and water.”
Sunan Ibn Majah Book 37, Hadith 45
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Sunan Ibn Majah Book 37, Hadith 44 Next Hadith → “There would come a month when no smoke was seen in any of the households of the family of Muhammad (ﷺ). I said: "What did you eat?" She said: "The two black ones - dates and water." But we had neighbors among the Ansar, sincere neighbors, who had domestic sheep, and they used to send some of their milk to us. (One of the narrators) Muhammad said: "And they were nine households."

Sunan Ibn Majah Book 37, Hadith 46