Sunan Abi Dawud 1213
سنن أبي داود#1213Sahihحَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى الرَّازِيُّ، أَخْبَرَنَا عِيسَى، عَنِ ابْنِ جَابِرٍ، بِهَذَا الْمَعْنَى . قَالَ أَبُو دَاوُدَ وَرَوَاهُ عَبْدُ اللَّهِ بْنُ الْعَلاَءِ عَنْ نَافِعٍ، قَالَ حَتَّى إِذَا كَانَ عِنْدَ ذَهَابِ الشَّفَقِ نَزَلَ فَجَمَعَ بَيْنَهُمَا .
This tradition has also been transmitted by Ibrahim b. Musa al-Razi, from 'Isa, on the authority of Ibn Jabir to the same effect. Abu Dawud said:'Abd Allah b. al-'Ala' narrated on the authority of Nafi' saying: When the twilight was about to disappear, he alighted and combined both (the prayers)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 4:16