Sayyiduna Hudhayfah (may Allah be pleased with him) said: Only three of those people remain, as if he was referring to this verse: "Then fight the leaders of disbelief" [Surah al-Tawbah: 12]. And he said: Only four of the hypocrites remain. He (the narrator) said: A Bedouin was sitting behind us, and he said: You are the community of Companions; you know what we do not know. You claim that only four hypocrites remain, so who are those who wreak havoc in our houses at night? Sayyiduna Hudhayfah (may Allah be pleased with him) said: Those are the sinners (fussaq). Only four of the hypocrites remain; one of them is a very old man who, even if he drank cold water, would not feel its coolness.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المرتد / 16846