Bulugh al-Maram
Bulugh al-Maram 83
وَعَنِ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا; أَنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -قَالَ: { يَأْتِي أَحَدَكُمُ الشَّيْطَانُ فِي صَلَاتِهِ, فَيَنْفُخُ فِي مَقْعَدَتِهِ فَيُخَيَّلُ إِلَيْهِ أَنَّهُ أَحْدَثَ, وَلَمْ يُحْدِثْ, فَإِذَا وَجَدَ ذَلِكَ فَلَا يَنْصَرِفُ حَتَّى يَسْمَعَ صَوْتًا أَوْ يَجِدَ رِيحًا } أَخْرَجَهُ اَلْبَزَّار ُ 1 .1 - رواه البزار (281).
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Ibn ‘Abbas (may Allah be pleased with them both) reported that the Messenger of Allah (peace and blessings be upon him) said: ‘Satan comes to one of you during his prayer and blows at his backside, making him imagine that he has passed wind when he has not. If this happens, he should not leave until he hears a sound or detects an odor.’ Al-Bazzar reported it. (1)
(1) Reported by al-Bazzar (281).
Notes and open questions — unreviewed
The source says the worshipper should not leave, without restating ‘his prayer’; the surrounding sentence indicates that he is praying.