وَعَن عَمْرو بن عبسة
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ بَنَى مَسْجِدًا لِيُذْكَرَ اللَّهُ فِيهِ بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ وَمَنْ أَعْتَقَ نَفْسًا مُسْلِمَةً كَانَتْ فِدْيَتَهُ مِنْ جَهَنَّمَ. وَمَنْ شَابَ شَيْبَةً فِي سَبِيلِ اللَّهِ كَانَتْ لَهُ نُورًا يَوْم الْقِيَامَة»
Amr ibn Abasa reported the Prophet (sallallahu alayhi wa sallam) as saying, “If anyone builds a mosque that God may be mentioned in it, a house will be built for him in paradise; if anyone emancipates a Muslim, that will be his ransom from jahannam; if anyone develops a grey hair while in ‘God’s path, it will be a light for him on the day of resurrection.’ It is transmitted in Sharh as-sunna.”
Mishkat al-Masabih 3252, Book 15, Emancipation, Hadith 4. 1 min read