The Prophet (ﷺ) said, "None of you should spit in front or on his right but he could spit either on his left or under his foot."
Sahih al-Bukhari Book 8, Hadith 62
← Previous Hadith 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."

Sahih al-Bukhari Book 8, Hadith 61 Next Hadith → The Prophet (ﷺ) said, "A faithful believer while in prayer is speaking in private to his Lord, so he should neither spit in front of him nor to his right side but he could spit either on his left or under his foot."

Sahih al-Bukhari Book 8, Hadith 63