Language:
كتاب الأذان
10  
Call to Prayers (Adhaan)
(132)
Chapter: If one does not perform the prostrations perfectly
(132)
باب إِذَا لَمْ يُتِمَّ السُّجُودَ
Sahih al-Bukhari 808

Narrated Abu Wail:

Hudhaifa said, "I saw a person not performing his bowing and prostrations perfectly. When he completed the prayer, I told him that he had not prayed." I think that Hudhaifa added (i.e. said to the man), "Had you died, you would have died on a tradition other than that of the Prophet (ﷺ) Muhammad."

حَدَّثَنَا الصَّلْتُ بْنُ مُحَمَّدٍ، قَالَ حَدَّثَنَا مَهْدِيٌّ، عَنْ وَاصِلٍ، عَنْ أَبِي وَائِلٍ، عَنْ حُذَيْفَةَ، رَأَى رَجُلاً لاَ يُتِمُّ رُكُوعَهُ وَلاَ سُجُودَهُ، فَلَمَّا قَضَى صَلاَتَهُ قَالَ لَهُ حُذَيْفَةُ مَا صَلَّيْتَ ـ قَالَ وَأَحْسِبُهُ قَالَ ـ وَلَوْ مُتَّ مُتَّ عَلَى غَيْرِ سُنَّةِ مُحَمَّدٍ صلى الله عليه وسلم‏.‏
Reference : Sahih al-Bukhari 808
In-book reference : Book 10, Hadith 203
USC-MSA web (English) reference : Vol. 1, Book 12, Hadith 772
  (deprecated numbering scheme)