وَعَنْ أَنَسٍ رضى الله عنه
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«إِذَا كَانَ أَحَدُكُمْ فِي اَلصَّلَاةِ فَإِنَّهُ يُنَاجِي رَبَّهُ، فَلَا يَبْزُقَنَّ بَيْنَ يَدَيْهِ وَلَا عَنْ يَمِينِهِ، وَلَكِنْ عَنْ شِمَالِهِ تَحْتَ قَدَمِهِ» مُتَّفَقٌ عَلَيْهِ 11 صحيح
The Messenger of Allah (sallallahu alayhi wa sallam) 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”.
Bulugh al-Maram 290, Book 2, The Book of Prayer, Hadith 111. 1 min read