رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 1465
The Book of Du'a (Supplications)
Issues regarding Supplications, their Virtues and Supplications of the Prophet (ﷺ)
وَعَنِ النُّعْمَانِ بْنِ بَشِيرٍ رَضِيَ اَللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: الدعاء هو العبادة .
An-Nu'man bin Bashir (May Allah be pleased with them) reported: The Prophet (ﷺ) said, "Du'a (supplication) is worship." [Abu Dawud].
Riyad as-Salihin, 1465