وَحَدَّثَنِي يَحْيَى ، عَنْ مَالِك ، عَنْ
هِشَامِ بْنِ عُرْوَةَ ، أَنَّ
أَبَاهُ قَالَ لَهُ :
" إِذَا كُنْتَ فِي سَفَرٍ ، فَإِنْ شِئْتَ أَنْ تُؤَذِّنَ وَتُقِيمَ فَعَلْتَ ، وَإِنْ شِئْتَ فَأَقِمْ وَلَا تُؤَذِّنْ " . ¤ قَالَ يَحْيَى : سَمِعْتُ مَالِكًا ، يَقُولُ : لَا بَأْسَ أَنْ يُؤَذِّنَ الرَّجُلُ وَهُوَ رَاكِبٌ
Hazrat Hisham bin Urwah narrated from his father that when you are on a journey, you have the choice: you may say both the adhan and the iqamah, or only say the iqamah and not give the adhan.
Imam Malik, may Allah have mercy on him, said that there is nothing wrong with giving the adhan while riding.