Muwatta Malik, Book 9, Hadith 75 (USC-MSA) ⓘ

Yahya related to me from Malik from Yahya ibn Said from an-Numan ibn Murra that the Messenger of Allah, may Allah bless him and grant him peace, said,"What about drunkenness, stealing and adultery? "That was before anything had been revealed about them. They said, "Allah and His Messenger know best." He said, "They are excesses and in them is a punishment. And the worst of thieves is the one who steals his prayer." They said, "How does he steal his prayer, Messenger of Allah?" He replied, "He does not do ruku or sajda properly."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنِ النُّعْمَانِ بْنِ مُرَّةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مَا تَرَوْنَ فِي الشَّارِبِ وَالسَّارِقِ وَالزَّانِي ‏"‏ ‏.‏ وَذَلِكَ قَبْلَ أَنْ يُنْزَلَ فِيهِمْ ‏.‏ قَالُوا اللَّهُ وَرَسُولُهُ أَعْلَمُ ‏.‏ قَالَ ‏"‏ هُنَّ فَوَاحِشُ وَفِيهِنَّ عُقُوبَةٌ وَأَسْوَأُ السَّرِقَةِ الَّذِي يَسْرِقُ صَلاَتَهُ ‏"‏ ‏.‏ قَالُوا وَكَيْفَ يَسْرِقُ صَلاَتَهُ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ لاَ يُتِمُّ رُكُوعَهَا وَلاَ سُجُودَهَا ‏"‏ ‏.‏