The Messenger of Allah ﷺ said, "Whoever eats seven Ajwa dates from between the two lava plains of Madinah on an empty stomach in the morning, nothing will harm him for the rest of that day until evening."Fulayh said, "I think he also said, 'And if he eats them in the evening, nothing will harm him until morning.'"Umar said, "Be careful, Amir, about what you narrate from the Messenger of Allah ﷺ."He replied, "I bear witness that I have not lied about Saad, and Saad has not lied about the Messenger of Allah ﷺ."
حدثنا أبو عامر حدثنا فليح عن عبد الله بن عبد الرحمن يعني ابن معمر قال حدث عامر بن سعد عمر بن عبد العزيز وهو أمير على المدينة أن
قال رسول الله ﷺ من أكل سبع تمرات عجوة من بين لابتي المدينة على الريق لم يضره يومه ذلك شيء حتى يمسي قال فليح وأظنه قال وإن أكلها حين يمسي لم يضره شيء حتى يصبح فقال عمر انظر يا عامر ما تحدث عن رسول الله ﷺ فقال أشهد ما كذبت على سعد وما كذب سعد على رسول الله ﷺ
Its isnad is sahih. Abu Amir is Aqdi. Fulayh is Ibn Sulayman bin Abu Mughira, the Madinan, and Fulayh is a nickname that became predominant for him, his actual name being Abdul-Malik. He is trustworthy, though he has been criticized considerably, and Ibn Main and others declared him daif. The apparent reason for this is that he used to criticize the men of Malik. Ibn Adi said, "Fulayh has sound hadiths. He narrates from the shaykhs of the people of Madinah both correct hadiths and rare ones. Bukhari relied on him in his Sahih and narrated extensively from him, and in my view there is no harm in him." Hakim said, "The agreement of the two shaykhs upon him strengthens his standing." Bukhari gave him a biographical entry in al-Kabir 4/1/133 and al-Saghir 193, without mentioning any criticism of him in it. Even so, he was not alone in narrating this hadith, as will be shown.Abdullah bin Abdul-Rahman bin Mamar bin Hazm Ansari, Abu Tawala (with the ta pronounced with a "u" sound), was the judge of Madinah in the time of Umar bin Abdul-Aziz, and he is trustworthy with many hadiths.The hadith was narrated by Muslim, 4:143, by way of Sulayman bin Bilal from Abdullah bin Abdul-Rahman. He also narrated it through other routes from Hashim bin Hashim from Amir bin Saad. Likewise, Bukhari narrated it, 9:493, 10:203, and Abu Dawud, 4:4, by way of Hashim bin Hashim.