Mukhtasar Sahih Bukhari — Hadith 331

Sayyiduna Anas (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Be moderate in prostrations, and none of you should spread his hands like a dog. And when spitting, he should not spit in front of himself nor to his right side, because he is conversing with his Lord."