Al-Kāfi - Volume 1 > Chapter on Miscellaneous Ahadith
Hadith #4

4ـ الْحُسَيْنُ بْنُ مُحَمَّدٍ الاشْعَرِيُّ وَمُحَمَّدُ بْنُ يَحْيَى جَمِيعاً عَنْ أَحْمَدَ بْنِ إِسْحَاقَ عَنْ سَعْدَانَ بْنِ مُسْلِمٍ عَنْ مُعَاوِيَةَ بْنِ عَمَّارٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلام) فِي قَوْلِ الله عَزَّ وَجَلَّ وَلله الاسْماءُ الْحُسْنى‏ فَادْعُوهُ بِها قَالَ نَحْنُ وَالله الاسْمَاءُ الْحُسْنَى الَّتِي لا يَقْبَلُ الله مِنَ الْعِبَادِ عَمَلاً إِلا بِمَعْرِفَتِنَا.

4. Al-Husayn ibn Muhammad al-Ash‘ari and Muhammad ibn Yahya altogether have narrated from Ahmad ibn Ishaq from Su‘dan ibn Muslim from Mu‘awiya ibn ‘Ammar from abu ‘Abdallah (a.s.) who has said the following about the words of Allah. “God has the most blessed Names. You should address Him in your worship by these Names . .” (7:180) The Imam said, “We, I swear by Allah, are the most blessed names of Allah without which Allah does not accept any of the good deeds of His servants until they know us properly.”