It is narrated from Sayyidah Aishah (may Allah be pleased with her) that Sayyiduna Bilal (may Allah be pleased with him) came to the Prophet (peace and blessings be upon him) to inform him of the dawn prayer and found him asleep, so he said: "Prayer is better than sleep." Then these words were retained in the adhan of the dawn prayer.
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Zuhri except Salih bin Abi al-Akhdar, and no one narrated it from Salih except Amr bin Salih; Amir bin Ibrahim is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 7583
Hadith Gradingمحدثین:إسناده ضعيف لضعف صالح بن أبي الأخضر
Hadith Takhrij«قال الهيثمي: فيه صالح بن أبي الأخضر واختلف في الاحتجاج به ولم ينسبه أحد إلى الكذب «مجمع الزوائد ومنبع الفوائد، ج 1، ص 330»»