Sayyiduna Abdullah bin Salam (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "O Allah, bless my Ummah in their morning endeavours for them."
Abu Ya'la and al-Tabarani in al-Kabir recorded it. Its chain contains Hisham bin Ziyad, who is extremely da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب البيوع / 6217