Musannaf Ibn Abi Shaybah 2176 — Those who said in the adhan: Prayer

The last words of the tathwib (the added call to prayer at Fajr) of Sayyiduna Abu Mahdhurah and Sayyiduna Bilal (may Allah be pleased with them both) used to be: "Al-salatu khayrun min al-nawm (prayer is better than sleep)."