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:2107ʿAlī b. Aḥmad b. ʿAbdān > Aḥmad b. ʿUbayd al-Ṣaffār > al-Asfāṭī > Abū al-Walīd > Abū al-Aḥwaṣ > Abū Isḥāq > al-Aswad

[Machine] And he said, "This is the one, besides whom there is no god, at the time of this prayer."  

البيهقي:٢١٠٧أَخْبَرَنَا عَلِيُّ بْنُ أَحْمَدَ بْنِ عَبْدَانَ أنا أَحْمَدُ بْنُ عُبَيْدٍ الصَّفَّارُ ثنا الْأَسْفَاطِيُّ أنا أَبُو الْوَلِيدِ أنا أَبُو الْأَحْوَصِ عَنْ أَبِي إِسْحَاقَ عَنِ الْأَسْوَدِ قَالَ كَانَ عَبْدُ اللهِ يُصَلِّي الْمَغْرِبَ حِينَ تَغْرُبُ الشَّمْسُ

وَقَالَ هَذَا وَالَّذِي لَا إِلَهَ غَيْرُهُ وَقْتُ هَذِهِ الصَّلَاةِ