"O Messenger of Allah, these are Banu Tha'labah who killed so and so during the Jahiliyyah: avenger us! He raised his arms until the whiteness of his armpits could be seen and said: "No mother's sin can affect her child," twice. (Shaih) (Using translation from Nasāʾī 4839)
يَا رَسُولَ اللهِ هَؤُلَاءِ بَنُو ثَعْلَبَةَ الَّذِينَ قَتَلُوا فُلَانًا فِي الْجَاهِلِيَّةِ فَخُذْ لَنَا بِثَأْرِنَا فَرَفَعَ يَدَيْهِ حَتَّى رَأَيْتُ بَيَاضَ إِبِطَيْهِ وَهُوَ يَقُولُ «لَا تَجْنِي أُمٌّ عَلَى وَلَدٍ مَرَّتَيْنِ»