In one narration the words are: "The two of them meet one another from the distance of a day and a night."
Imam Ahmad recorded this narration, and its narrators have been declared trustworthy despite weakness in some of them.
Imam al-Tabarani recorded this narration.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الزهد / 17980