The Prophet ﷺ said: The intercession of a martyr will be accepted for seventy members of his family. Abu Dawud said: The correct name if the narrator is Rabah b. al-Walid (and not al-walid b. Rabah as occurred in the chain of narrators in the text of the tradition)
دَخَلْنَا عَلَى أُمِّ الدَّرْدَاءِ وَنَحْنُ أَيْتَامٌ فَقَالَتْ أَبْشِرُوا فَإِنِّي سَمِعْتُ أَبَا الدَّرْدَاءِ يَقُولُ قَالَ رَسُولُ اللَّهِ ﷺ يُشَفَّعُ الشَّهِيدُ فِي سَبْعِينَ مِنْ أَهْلِ بَيْتِهِ
[Machine] "We entered upon Umm ad-Darda while we were young orphans, so she wiped our heads and said, 'Rejoice, O my sons, for I hope that you will be among the intercession of your father. For I heard Abu Darda say I heard the Messenger of Allahﷺ say, 'A martyr will intercede for seventy members of his household.'"
دَخَلْنَا عَلَى أُمِّ الدَّرْدَاءِ وَنَحْنُ أَيْتَامٌ صِغَارٌ فَمَسَحَتْ رُءُوسَنَا وَقَالَتْ أَبْشِرُوا يَا بَنِيَّ فَإِنِّي أَرْجُو أَنْ تَكُونُوا فِي شَفَاعَةِ أَبِيكُمْ فَإِنِّي سَمِعْتُ أَبَا الدَّرْدَاءِ يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «الشَّهِيدُ يَشْفَعُ فِي سَبْعِينَ مِنْ أَهْلِ بَيْتِهِ»