Mishkat al-Masabih 30 Fine Qualities كتاب المناقب 172

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «الْعَبَّاسُ مِنِّي وَأَنَا مِنْهُ» رَوَاهُ التِّرْمِذِيّ

Ibn `Abbas reported God’s messenger as saying, “Al-`Abbas pertains to me and I to him.” Tirmidhi transmitted it.