Volume 1, Book 8, Number 408:
Narrated Abu Huraira:
Prophet said, “If anyone of you stands for prayer, he should not spit in front of him because in
prayer he is speaking in private to Allah and he should not spit on his right as there is an angel, but
he can spit either on his left or under his left foot and bury it (i.e. expectoration).”
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SAHIH BUKHARI VOLUME 1 > BOOK 8: PRAYERS (SALAT)