كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 245
Narrated Anas (RA):
Allah's Messenger (ﷺ) said: "When anyone of you is engaged in Salat (prayer), he is holding intimate conversation with his Rabb so he should not spit in front of him, nor to his right side, but to his left side, under his foot". [Agreed upon].
وَعَنْ أَنَسٍ ‏- رضى الله عنه ‏- قَالَ : قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ إِذَا كَانَ أَحَدُكُمْ فِي اَلصَّلَاةِ فَإِنَّهُ يُنَاجِي رَبَّهُ , فَلَا يَبْزُقَنَّ بَيْنَ يَدَيْهِ وَلَا عَنْ يَمِينِهِ , وَلَكِنْ عَنْ شِمَالِهِ تَحْتَ قَدَمِهِ } مُتَّفَقٌ عَلَيْهِ 1
Reference : Bulugh al-Maram 245
In-book reference : Book 2, Hadith 245
English translation : Book 2, Hadith 243
Bulugh al-Maram 245
A narration has:
"or under his foot."
وَفِي رِوَايَةٍ : { أَوْ تَحْتَ قَدَمِهِ } 1
Reference : Bulugh al-Maram 245
In-book reference : Book 2, Hadith 245
Hadith Text
Reference