The Book of Fasting
وَحَدَّثَنَاهُ أَبُو كُرَيْبٍ، حَدَّثَنَا ابْنُ بِشْرٍ، عَنْ مِسْعَرٍ، حَدَّثَنَا حَبِيبُ بْنُ أَبِي ثَابِتٍ، بِهَذَا الإِسْنَادِ وَقَالَ " وَنَفِهَتِ النَّفْسُ " .This hadith is narrated on the authority of Habib b. Abu Thabit with the same chain of transmitters and he said:" And you would become exhausted
From Sahih Muslim, whose reports the scholars accept as authentic.