Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bayhaqi:3112Shuʿbah Biʾisnādih

[Machine] He said, "So he used to exert himself in the second rakah of the Fajr prayer and not exert himself in the rest of his prayers." Abu Abdullah informed us, he said Abdur Rahman ibn Al-Hasan told us, he said Ibrahim ibn Al-Hussein told us, he said Adam told us, he said Shu'bah mentioned it. And in this is evidence of the abbreviation that occurred in the hadith.  

البيهقي:٣١١٢وَرَوَاهُ آدَمُ بْنُ أَبِي إِيَاسٍ عَنْ شُعْبَةَ بِإِسْنَادِهِ

وَقَالَ فَكَانَ يَقْنُتُ فِي الرَّكْعَةِ الثَّانِيَةِ مِنْ صَلَاةِ الْفَجْرِ وَلَا يَقْنُتُ فِي سَائِرِ صَلَوَاتِهِ أَخْبَرَنَاهُ أَبُو عَبْدِ اللهِ ثنا عَبْدُ الرَّحْمَنِ بْنُ الْحَسَنِ ثنا إِبْرَاهِيمُ بْنُ الْحُسَيْنِ ثنا آدَمُ ثنا شُعْبَةُ فَذَكَرَهُ وَفِي هَذَا دَلِيلٌ عَلَى اخْتِصَارٍ وَقَعَ فِي الْحَدِيثِ الَّذِي