Sayyiduna Salamah bin Akwa’ (may Allah be pleased with him) narrates: In the blessed time of the Prophet (peace and blessings be upon him), the words of the adhan were pronounced twice and the words of the iqamah were pronounced once.
Hadith Referenceسنن الدارقطني / كتاب الصلاة / 931
Hadith Takhrij«أخرجه الدارقطني فى ((سننه)) برقم: 931، انفرد به المصنف من هذا الطريق»