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السيوطي:٢١٨٣٦a

"مَنْ سَنَّ سُنَّةً حَسَنَةً فَلَهُ أَجْرُهَا مَا عُمِلَ بها في حَيَاتهِ وَبَعْدَ مَمَاتِهِ حَتَّى يُتْرك ومَن سَنَّ سُنَّةً سيَئةً فَعَلَيه إِثْمُهَا حَتَّى تُتْرَكَ، وَمَن مَاتَ مُرَابِطًا في سَبِيلِ الله جَرَى لَهُ أَجْرُ الْمُرَابطِ حَتَّى يُبْعَثَ يَوْمَ الْقِيَامَةِ".  

[طب] الطبرانى في الكبير والسجزى (في الإِبانة) عن واثلة

See similar narrations below:

Collected by Ṭabarānī
tabarani:18478[Chain 1] ʿAmr b. Isḥāq b. Ibrāhīm b. al-ʿAlāʾ from my father [Chain 2] Jaʿfar b. Muḥammad al-Firyābī > Ibrāhīm b. al-ʿAlāʾ al-Ḥimṣī > Ismāʿīl b. ʿAyyāsh > ʿUmar b. Ruʾbah > ʿAbd al-Wāḥid b. ʿAbdullāh al-Naṣrī > Wāthilah b. al-Asqaʿ

[Machine] Narrated by the Prophet ﷺ , he said, "Whoever starts a good Sunnah (practice) will have its reward and the reward of all those who follow it, until the Day of Judgment. And whoever starts a bad Sunnah (practice) will bear its sin and the sin of all those who follow it, until the Day of Judgment. And whoever dies while defending the cause of Allah, his reward will continue until the Day of Judgment."  

الطبراني:١٨٤٧٨حَدَّثَنَا عَمْرُو بْنُ إِسْحَاقَ بْنِ إِبْرَاهِيمَ بْنِ الْعَلَاءِ ثنا جَدِّي ح وَحَدَّثَنَا جَعْفَرُ بْنُ مُحَمَّدٍ الْفِرْيَابِيُّ ثنا إِبْرَاهِيمُ بْنُ الْعَلَاءِ الْحِمْصِيُّ ثنا إِسْمَاعِيلُ بْنُ عَيَّاشٍ عَنْ عُمَرَ بْنِ رُؤْبَةَ عَنْ عَبْدِ الْوَاحِدِ بْنِ عَبْدِ اللهِ النَّصْرِيِّ عَنْ وَاثِلَةَ بْنِ الْأَسْقَعِ

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ سَنَّ سُنَّةً حَسَنَةً فَلَهُ أَجْرُهَا مَا عَمِلَ بِهِ فِي حَيَاتِهِ وَبَعْدَ مَمَاتِهِ حَتَّى يَتْرُكَ وَمَنْ سَنَّ سُنَّةً سَيِّئَةً فَعَلَيْهِ إِثْمُهَا حَتَّى يَتْرُكَ وَمَنْ مَاتَ مُرَابِطًا فِي سَبِيلِ اللهِ جَرَى لَهُ أَجْرُ الْمُرَابِطِ حَتَّى يُبْعَثَ يَوْمَ الْقِيَامَةِ»