Bulugh al-Maram #367
The Book of Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَلِأَحْمَدَ وَاَلدَّارَقُطْنِيِّ نَحْوُهُ مِنْ وَجْهٍ آخَرَ , وَزَادَ : { فَأَمَّا فِي اَلصُّبْحِ فَلَمْ يَزَلْ يَقْنُتُ حَتَّى فَارَقَ اَلدُّنْيَا } . 11 - منكر . رواه أحمد ( 3 / 162 ) ، والدار قطني ( 2 / 39 ) .
Ahmad and ad-Daraqutni narrated something similar, adding that he (ﷺ) continued to recite Qunut (supplication in prayer) in the Fajr prayer till he separated from this world.
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About Bulugh al-Maram
This hadith is #367 from Bulugh al-Maram, in the Book of The Book of Prayer.