Al-Kāfi
Hadith 99- وَبِهَذَا الإسْنَادِ قَالَ قَالَ رَسُولُ اللهِ (صَلَّى اللهُ عَلَيْهِ وَآلِه) مَنْ بَلَّغَ رِسَالَةَ غَازٍ كَانَ كَمَنْ أَعْتَقَ رَقَبَةً وَهُوَ شَرِيكُهُ فِي ثَوَابِ غَزْوَتِهِ.
9. Through the same chain of narrators as that of the previous Hadith the following is narrated from Rasul Allah SAWA: “One who conveys the message of a fighter for the cause of Allah receives a reward equal to freeing a slave and he will have a share in the reward for his fighting for the cause of Allah in battle..”