VERILY, [O you who believe in Me,] this community of yours is one single community, since I am the Sustainer of you all: worship, then, Me [alone]!
Al-Anbiya (The Prophets) Verse 92
The Prophet 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 Bukhari: Volume 1, Book 8, Number 404