Muwatta Malik, 458

Malik said that he meant someone who, when he prostrated, kept his body close to the ground. Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, saw spittle on the wall of the qibla and scraped it off. Then he went up to the people and said, "Do not spit in front of you when you are praying, because Allah, the Blessed and Exalted, is in front of you when you pray

Abdallah Ibn Omar a rapporté que l'Envoyé d'Allah (salallahou alayhi wa salam) r (Sur lui la grâce et la paix d'Allah) vit un crachat sur le mur de la Ka'ba, il le frotta, puis s'adressa aux hommes disant: «quand l'un de vous prie, qu'il ne crache pas du côté de la qibla (litt: devant lui) car Allah Le Béni et le Très-Haut se trouve devant lui quand il fait la prière»