Hadith 410, 411 - Prayers (Salat) - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

8. Prayers (Salat) - كتاب الصلاة

35) Chapter: It is forbidden to spit on the right side while in Salat (prayers)

Narrated Abu Huraira and Abu Sa`id:

Allah's Messenger (ﷺ) saw some expectoration on the wall of the mosque; he took gravel and scraped it off and said, "If anyone of you wanted to spit, he should neither spit in front of him nor on his right but could spit either on his left or under his left foot."

Reference: 410, 411
English reference: Vol. 1, Book 8, Hadith 403
In-book reference: Book 8, Hadith 61
Grade: Sahih
Read this hadith from Darussalam Collection

35) باب لاَ يَبْصُقْ عَنْ يَمِينِهِ، فِي الصَّلاَةِ

حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ، أَنَّ أَبَا هُرَيْرَةَ، وَأَبَا، سَعِيدٍ أَخْبَرَاهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم رَأَى نُخَامَةً فِي حَائِطِ الْمَسْجِدِ، فَتَنَاوَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَصَاةً فَحَتَّهَا ثُمَّ قَالَ ‏‏‏.‏ "‏ إِذَا تَنَخَّمَ أَحَدُكُمْ فَلاَ يَتَنَخَّمْ قِبَلَ وَجْهِهِ وَلاَ عَنْ يَمِينِهِ، وَلْيَبْصُقْ عَنْ يَسَارِهِ، أَوْ تَحْتَ قَدَمِهِ الْيُسْرَى ‏"