Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 95

وَعَنِ ابْنِ عُمَرَ قَالَ: ذَكَرَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِتْنَةً فَقَالَ: «يُقْتَلُ هَذَا فِيهَا مَظْلُومًا» لِعُثْمَانَ. رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ إِسْنَادًا

Ibn `Umar told that God’s messenger mentioned a civil commotion and said of `Uthman, “This one will be wrongfully killed in it.” Tirmidhi transmitted it, saying this is a hasan tradition whose isnad is gharib .