صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب الفريضة فى السفرChapters on Prayers while Traveling
(389) بَابُ الْأَذَانِ وَالْإِقَامَةِ لِلصَّلَاتَيْنِ إِذَا جَمَعَ بَيْنَهُمَا فِي السَّفَرِ،389 Chapter: Adhan and Iqamah for Two Prayers When Combined While Traveling.
Hadith Q973
وَالدَّلِيلِ عَلَى أَنَّ الْأَوَّلَ مِنْهُمَا يُصَلَّى بِأَذَانٍ وَإِقَامَةٍ، وَالْأَخِيرَةَ مِنْهُمَا بِإِقَامَةٍ مِنْ غَيْرِ أَذَانٍ
And the explanation of the evidence that the first of these prayers will be performed with both the adhan and the iqamah, while the second will be performed only with the iqamah, without the adhan.
