صحيح البخاري Sahih Bukhari كتاب العمل في الصلاة The Book of Dealing With Actions In As-Salat (The Prayer)
بَابُ مَا يَجُوزُ مِنَ الْبُصَاقِ وَالنَّفْخِ فِي الصَّلاَةِ:

(12) Chapter. What is said about blowing and spitting while in As-Salat (the prayer).

2 hadith
Hadith 1213
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ ، حَدَّثَنَا حَمَّادٌ ، عَنْ أَيُّوبَ ، عَنْ نَافِعٍ ، عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا ، " أَنّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رَأَى نُخَامَةً فِي قِبْلَةِ الْمَسْجِدِ فَتَغَيَّظَ عَلَى أَهْلِ الْمَسْجِدِ وَقَالَ : إِنَّ اللَّهَ قِبَلَ أَحَدِكُمْ ، فَإِذَا كَانَ فِي صَلَاتِهِ فَلَا يَبْزُقَنَّ أَوْ قَالَ لَا يَتَنَخَّمَنَّ ، ثُمَّ نَزَلَ فَحَتَّهَا بِيَدِهِ " ، وَقَالَ ابْنُ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا : إِذَا بَزَقَ أَحَدُكُمْ فَلْيَبْزُقْ عَلَى يَسَارِهِ .
Narrated Ibn `Umar: The Prophet saw some sputum on the wall facing the Qibla of the mosque and became furious with the people of the mosque and said, "During the prayer, Allah is in front of everyone of you and so he should not spit (or said, 'He should not expectorate')." Then he got down and scratched the sputum with his hand. Ibn `Umar said (after narrating), "If anyone of you has to spit during the prayer, he should spit to his left."
Hadith Reference Sahih Bukhari / The Book of Dealing With Actions In As-Salat (The Prayer) / Hadith: 1213
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة
Hadith 1214
حَدَّثَنَا مُحَمَّدٌ ، حَدَّثَنَا غُنْدَرٌ ، حَدَّثَنَا شُعْبَةُ , قَالَ : سَمِعْتُ قَتَادَةَ ، عَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ ، عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ , قَالَ : " إِذَا كَانَ فِي الصَّلَاةِ فَإِنَّهُ يُنَاجِي رَبَّهُ ، فَلَا يَبْزُقَنَّ بَيْنَ يَدَيْهِ وَلَا عَنْ يَمِينِهِ ، وَلَكِنْ عَنْ شِمَالِهِ تَحْتَ قَدَمِهِ الْيُسْرَى " .
Narrated Anas: The Prophet said, "Whenever anyone of you is in prayer, he is speaking in private to his Lord and so he should neither spit in front of him nor on his right side but to his left side under his left foot."
Hadith Reference Sahih Bukhari / The Book of Dealing With Actions In As-Salat (The Prayer) / Hadith: 1214
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة