Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:23727 – Ḥasan b. Mūsá > Ibn Lahīʿah > Ibn Abū Jaʿfar > Abān b. Ṣāliḥ > Ibn Abū Zakariyyā al-Khuzāʿī > Salmān al-Khayr > Samiʿah / > Shuraḥbīl b. al-Simṭ Wahū Murābiṭ > al-Sāḥil

[Machine] I heard the Prophet ﷺ saying: "Whoever performs voluntary prayers or stays awake during the night for the worship of Allah, it is as if he fasted a whole month. And whoever dies while defending the cause of Allah, Allah will grant him the reward of all the prayers, fasting, and charity that he used to do. And he will be protected from the trials of the grave and the greatest terror."  

أحمد:٢٣٧٢٧ – حَدَّثَنَا حَسَنُ بْنُ مُوسَى حَدَّثَنَا ابْنُ لَهِيعَةَ حَدَّثَنَا ابْنُ أَبِي جَعْفَرٍ عَنْ أَبَانَ بْنِ صَالِحٍ عَنِ ابْنِ أَبِي زَكَرِيَّا الْخُزَاعِيِّ عَنْ سَلْمَانَ الْخَيْرِ أَنَّهُ سَمِعَهُ وَهُوَ يُحَدِّثُ شُرَحْبِيلَ بْنَ السِّمْطِ وَهُوَ مُرَابِطٌ عَلَى السَّاحِلِ يَقُولُ

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ مَنْ رَابَطَ يَوْمًا أَوْ لَيْلَةً كَانَ لَهُ كَصِيَامِ شَهْرٍ لِلْقَاعِدِ وَمَنْ مَاتَ مُرَابِطًا فِي سَبِيلِ اللهِ أَجْرَى اللهُ لَهُ أَجْرَهُ الَّذِي كَانَ يَعْمَلُ أَجْرَ صَلَاتِهِ وَصِيَامِهِ وَنَفَقَتِهِ وَوُقِيَ مِنْ فَتَّانِ الْقَبْرِ وَأَمِنَ مِنَالْفَزَعِ الْأَكْبَرِ  

See similar narrations below:

Collected by Ḥākim
hakim:2422 – Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. ʿAbdullāh b. ʿAbd al-Ḥakam > Ibn Wahb > al-Layth b. Saʿd > Ayyūb b. Mūsá al-Qurashī > Makḥūl > Shuraḥbīl > Salmān al-Fārisī

"Whoever guards Ribat (the frontier) for one day and one night, will be given a reward like that for fasting and praying Qiyam for a month, and whoever dies at Ribat (guarding the frontier) will be rewarded, and he will be given provision, and he will be kept safe from Al-Fattan." [1] [1] According to As-Sindi, the preferred pronunciation is Al-Fattan, plural of Fatan refering to Al-Munkar and An-Nakir, while Al-Fattan would refer to Ash-Shaitan or the like, among the punishment of the grave, or, the angels of chastisement. (Using translation from Nasāʾī 3167)  

الحاكم:٢٤٢٢ – حَدَّثَنَا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أَنْبَأَ مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ عَبْدِ الْحَكَمِ أَنْبَأَ ابْنُ وَهْبٍ أَخْبَرَنِي اللَّيْثُ بْنُ سَعْدٍ عَنْ أَيُّوبَ بْنِ مُوسَى الْقُرَشِيِّ عَنْ مَكْحُولٍ عَنْ شُرَحْبِيلَ عَنْ سَلْمَانَ الْفَارِسِيِّ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مَنْ رَابَطَ يَوْمًا وَلَيْلَةً فِي سَبِيلِ اللَّهِ كَانَ لَهُ أَجْرُ صِيَامِ شَهْرٍ وَقِيَامِهِ وَمَنْ مَاتَ مُرَابِطًا جَرَى لَهُ مِثْلُ ذَلِكَ الْأَجْرِ وَأَجْرَى عَلَيْهِ الرِّزْقَ وَأُومِنَ مِنَ الْفَتَّانَ»  

«هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ وَلِمَكْحُولٍ الْفَقِيهِ فِيهِ مُتَابِعٌ مِنَ الشَّامِيِّينَ»