From Sahih Bukhari (Hadith 5460):
Narrated .Abu Huraira:The Prophet (ﷺ) said, "When your servant brings your food to you, if you do not ask him to join you, then at least ask him to take one or two handfuls, for he has suffered from its heat (while cooking it) and has taken pains to cook it nicely
Reference: Bukhari 5460