In one narration the words are: "They were from five to seven" (the narrator is in doubt, or perhaps the words are:) "from eight to nine, which were to be spent." Ahmad recorded all these narrations with various chains, and the narrators of one of them are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزهد / 17761