Sayyiduna Anas (may Allah be pleased with him) narrates that Sayyiduna Bilal (may Allah be pleased with him) used to say the adhan in double phrases and the iqamah in single phrases, except for « قَد قَامَتِ الصَّلَاةُ » (which he would say twice). Imam Abu Bakr (may Allah have mercy on him) says that Ibn Mathna’s narration from Sayyiduna Ibn Umar (may Allah be pleased with them both) is related to this same chapter.