Al-Kāfi #1668“I once asked him (the Imam) (a.s.), about Friday. He (the Imam) said, ‘It has Adhan and ‘Iqamah and the Imam comes out after Adhan, climbs...
Al-Kāfi #1124“I once heard abu ‘Abd Allah (a.s.), say, ‘Adhan is twice and twice and ‘Iqamah is twice and twice.’”