The call of Salat (prayer) and standing for Salat, e.g.,
الْعِلَلُ، عَنْ مُحَمَّدِ بْنِ الْحَسَنِ بْنِ الْوَلِيدِ عَنْ مُحَمَّدِ بْنِ الْحَسَنِ الصَّفَّارِ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْحَمِيدِ وَ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ عَنْ صَفْوَانَ بْنِ مِهْرَانَ عَنْ أَبِي عَبْدِ اللَّهِ ع قَالَ: الْأَذَانُ مَثْنَى مَثْنَى وَ الْإِقَامَةُ مَثْنَى مَثْنَى وَ لَا بُدَّ فِي الْفَجْرِ وَ الْمَغْرِبِ مِنْ أَذَانٍ وَ إِقَامَةٍ فِي الْحَضَرِ وَ السَّفَرِ لِأَنَّهُ لَا يُقَصَّرُ فِيهِمَا فِي حَضَرٍ وَ لَا سَفَرٍ
(The book) ‘Al Ilal’ – from Muhammad Bin Al Hassan Bin Al Waleed, from Muhammad Bin Al Hassan Al Saffar, from Muhammad Bin Abdul Al Humeyd, and Ahmad Bin Muhammad Bin Isa, from Ahmad Bin Muhammad Bin Abu Nasr, from Safwan Bin Mihran,
From Abu Abdullah-asws having said: ‘الْأَذَانُ’ the Azaan (call to Salat) is double, double (sentences), and ‘الْإِقَامَةُ’ the Iqama (Standing for Salat) is double, double (sentences, and there is no escape in Al-Fajr (Salat), and Al-Maghrib (Salat)) from (proclaiming) the Azaan and the Iqama during the staying and the travelling, because there is no reduction in these two (Salats), neither during staying nor travelling.
وَ يُجْزِيكَ إِقَامَةٌ بِغَيْرِ أَذَانٍ فِي الظُّهْرِ وَ الْعَصْرِ وَ الْعِشَاءِ الْآخِرَةِ وَ الْأَذَانُ وَ الْإِقَامَةُ فِي جَمِيعِ الصَّلَوَاتِ أَفْضَلُ.
‘And (proclaiming) an Iqama without Azaan will suffice you regarding Al-Zohr, and Al-Asr, and Al-Isha the last (Salats), and (although proclaiming) the Azaan and the Iqama in entirety of the Salats is better’.[1]
[1] Bihar Al-Anwaar V 81 – The Book Salat – Ch 35 H 7