Al-Adab Al-Mufrad #717
Supplication
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عُبَيْدُ اللهِ، عَنِ مُبَارَكِ بْنِ حَسَّانَ، عَنْ عَطَاءٍ، عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: سُئِلَ النَّبِيُّ صلى الله عليه وسلم: أَيُّ الْعِبَادَةِ أَفْضَلُ؟ قَالَ: دُعَاءُ الْمَرْءِ لِنَفْسِهِ.
'A'isha said, "The Prophet, may Allah bless him and grant him peace,
was asked, 'Which type of worship is best?' He replied, 'A man's supplication
for himself.'"
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About Al-Adab Al-Mufrad
This hadith is #717 from Al-Adab Al-Mufrad, in the Book of Supplication.