Abu Hurairah reported,

I asked, "Messenger of Allah, who will be the most fortunate of people to receive your intercession on the Day of Resurrection?"He replied, "I had thought, Abu Hurayrah, that no one would ask me about this matter before you, given the eagerness for hadith I have seen in you. The most fortunate of people to receive my intercession on the Day of Resurrection is the one who says, 'There is no god but Allah,' sincerely from his heart."

Azami 10353

Sahih

عن أبي هريرة قال

قلت: يا رسول الله: من أسعد الناس بشفاعتك يوم القيامة؟ فقال: لقد ظننت يا أبا هريرة أن لا يسألني عن هذا الحديث أحد أول منك، لما رأيت من حرصك على الحديث، أسعد الناس بشفاعتي يوم القيامة من قال: لا إله إلا الله خالصا من قبل نفسه.

الأعظمي 10353صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Virtues of the Companions and reports about them
Chapter
Virtues of individual Companions and their reports
Section
Virtues of Abu Hurairah Abdul-Rahman bin Sakhr and reports about him
Numbering
Jami al-Kamil 10353 (2nd edition)
Azami 10353