Muslim bin Abi Maryam says that Hazrat Ali (may Allah be pleased with him) bin Hussain used to give the call to prayer (adhan). When he reached "Hayya 'ala al-falah," he would say "Hayya 'ala khayr al-'amal" and would state that this was the original adhan.

Hazrat Ibn Umar (may Allah be pleased with them both) used to say "As-salatu khayrun minan-nawm" in his adhan, and sometimes he would also say "Hayya 'ala khayril-'amal."

Hazrat Ibn Umar (may Allah be pleased with them both) would sometimes add "Hayya 'ala Khayr al-'Amal" in his adhan.