Sayyiduna Nawwas bin Sam'an al-Kilabi (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "O Allah, bless my Ummah in their morning endeavours."
Al-Tabarani recorded it in al-Kabir. Its chain contains Ammar bin Harun, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6229