"The Prophet (S) prohibited than a man to pray with his hands on his hip."
Jami` at-Tirmidhi Book 2, Hadith 235
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Jami` at-Tirmidhi Book 2, Hadith 234 Next Hadith → He passed by Al-Hasan bin Ali while he was performing Salat and he had gathered his locks at the back of his head, so he (Abu Rafi) undid them, and Al-Hasan turned to him angrily. He said: "Resume your Salat and do not be angry, for indeed I heard Allah's Messenger (S) saying: 'That is the seat of Ash-Shaitan.'"

Jami` at-Tirmidhi Book 2, Hadith 236