Mishkat al-Masabih 27 Fitan كتاب الفتن 37

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: ” لَا تَذْهَبُ الْأَيَّامُ وَاللَّيَالِي حَتَّى يَمْلِكَ رَجُلٌ يُقَالُ لَهُ: الْجَهْجَاهُ “. وَفِي رِوَايَةٍ: ” حَتَّى يَمْلِكَ رَجُلٌ مِنَ الْمَوَالِي يُقَالُ لَهُ: الجَهجاه “. رَوَاهُ مُسلم

He reported God’s messenger as saying, “Days and nights will not pass away before a man called al-Jahjah rules.” A version has “Before one of the clients called al-Jahjah rules.” Muslim transmitted it.