Yahya related to me from Malik from Nafi that on a journey Abdullah ibn Umar did no more than the iqama, except for subh, when he called both the adhan and the iqama. Abdullah ibn Umar used to say, "The adhan is for an imam whom people join ."
أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ كَانَ لاَ يَزِيدُ عَلَى الإِقَامَةِ فِي السَّفَرِ إِلاَّ فِي الصُّبْحِ فَإِنَّهُ كَانَ يُنَادِي فِيهَا وَيُقِيمُ وَكَانَ يَقُولُ إِنَّمَا الأَذَانُ لِلإِمَامِ الَّذِي يَجْتَمِعُ النَّاسُ إِلَيْهِ
[Machine] Ibn Umar used to only prolong his stay during his travels for prayer, except for the morning prayer. He would give the call to prayer for it, establish it, and say, "The call to prayer is only for the Imam, to whom the people gather."
أَنَّ ابْنَ عُمَرَ كَانَ لَا يَزِيدُ عَلَى الْإِقَامَةِ فِي السَّفَرِ فِي الصَّلَاةِ إِلَّا فِي الصُّبْحِ فَإِنَّهُ كَانَ يُؤَذِّنُ فِيهَا وَيُقِيمُ وَيَقُولُ إِنَّمَا الْأَذَانُ لِلْإِمَامِ الَّذِي يَجْتَمِعُ إِلَيْهِ النَّاسُ