Sunan Abi Dawud 1219
The above mentioned tradition has also been reported by 'Uqail through a different chain of narrators. He said:
He would delay the evening prayer till he combined the evening and the night prayers when the twilight disappeared.
حَدَّثَنَا سُلَيْمَانُ بْنُ دَاوُدَ الْمَهْرِيُّ، حَدَّثَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي جَابِرُ بْنُ إِسْمَاعِيلَ، عَنْ عُقَيْلٍ، بِهَذَا الْحَدِيثِ بِإِسْنَادِهِ قَالَ وَيُؤَخِّرُ الْمَغْرِبَ حَتَّى يَجْمَعَ بَيْنَهَا وَبَيْنَ الْعِشَاءِ حِينَ يَغِيبُ الشَّفَقُ ‏.‏