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:1842Abū ʿAbdullāh > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Abū Qilābah > Saʿīd b. ʿĀmir > Shuʿbah > Sufyān al-Thawrī > Abū Ṭuʿmah

[Machine] Ibn Umar used to give the call to prayer while on his mount, and it was narrated that there is a hadith in this regard which is considered to be "mursal."  

البيهقي:١٨٤٢وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا أَبُو قِلَابَةَ ثنا سَعِيدُ بْنُ عَامِرٍ ثنا شُعْبَةُ عَنْ سُفْيَانَ الثَّوْرِيِّ عَنْ أَبِي طُعْمَةَ

أَنَّ ابْنَ عُمَرَ كَانَ يُؤَذِّنُ عَلَى رَاحِلَتِهِ وَرُوِي فِيهِ حَدِيثٌ مُرْسَلٌ