The Book of Prayer - Travellers
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَتَحَرَّى أَحَدُكُمْ فَيُصَلِّي عِنْدَ طُلُوعِ الشَّمْسِ وَلاَ عِنْدَ غُرُوبِهَا " .Ibn 'Umar reported Allah's Messenger (ﷺ) as saying:Let not any one of you intend to observe prayer at the time of the rising of the sun or of the setting sun
From Sahih Muslim, whose reports the scholars accept as authentic.