Hadith.2945 - It was narrated from Imam (as) that he said:
"Whoever brings a sacrificial animal during Umrah should slaughter it before shaving his head."
Imam (as) further said
"And whoever brings a sacrificial animal while performing Umrah should slaughter it at the designated slaughtering place (Manhar), which is between Safa and Marwah, at al-Hazwarah."