Al-Kāfi

Hadith 699
brotherhoodparadise
7ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ إِسْحَاقَ عَنْ بَكْرِ بْنِ مُحَمَّدٍ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ مَا قَضَى مُسْلِمٌ لِمُسْلِمٍ حَاجَةً إِلا نَادَاهُ الله تَبَارَكَ وَتَعَالَى عَلَيَّ ثَوَابُكَ وَلا أَرْضَى لَكَ بِدُونِ الْجَنَّةِ.
7. Al-Husayn ibn Muhammad has narrated from Ahmad ibn Muhammad ibn Ishaq from Bakr ibn Muhammad from Abu ‘Abdillah (a.s.) who has said the following: “Whenever a Muslim helps make the wish of a Muslim to come true, Allah, the Most Blessed, the Most High, says, ‘With Me is your reward and I will not agree to allow it to be less than paradise.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī