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

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."

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."