The Messenger of Allah ﷺ said to me, "Whomever you meet who testifies that there is no god but Allah, with his heart convinced of it, give him the glad tidings of Paradise."Umar struck him with his hand and said, "Go back."The Messenger of Allah ﷺ said to him, "Umar, what made you do that?"Umar replied, "Messenger of Allah, may my father and mother be sacrificed for you, did you send Abu Hurayrah with your sandals to give the glad tidings of Paradise to whomever he meets who testifies that there is no god but Allah, with his heart convinced of it?"He said, "Yes."Umar said, "Do not do that, for I fear that people will rely on it. Let them keep working."The Messenger of Allah ﷺ said, "Then let them be."
قال لي رسول الله ﷺ: من لقيت يشهد أن لا إله إلا الله مستيقنا بها قلبه بشره بالجنة. فضربه عمر بيده وقال: ارجع فقال له رسول الله ﷺ: يا عمر ما حملك على ما فعلت؟ قال يا رسول الله، بأبي أنت وأمي، أبعثت أبا هريرة بنعليك من لقي يشهد أن لا إله إلا الله مستيقنا بها قلبه بشره بالجنة؟ قال: نعم قال: فلا تفعل، فإني أخشى أن يتكل الناس عليها، فخلهم يعملون، قال رسول الله ﷺ: فخلهم.
Muslim narrated it in the Book of Faith (31), from Zuhayr bin Harb, who said, Umar bin Yunus Hanafi narrated to us, who said, Ikrima bin Ammar narrated to us, who said, Abu Kathir narrated to me, who said, Abu Hurairah narrated to me, and he mentioned it.