From Sahih Bukhari (Hadith 1723):
Narrated Ibn `Abbas:The Prophet (ﷺ) was asked by a man who said, "I have done the Rami in the evening." The Prophet (ﷺ) replied, "There is no harm in it." Another man asked, "I had my head shaved before the slaughtering." The Prophet (ﷺ) replied, "There is no harm in it
Reference: Bukhari 1723