From Sahih Muslim (Hadith 2358):
Abu Huraira reported that the Messenger of Allah (ﷺ) forbade (to do certain things) and then he made a mention of certain habits and said:He who gives a she-camel as a gift, for him is the reward (of the gift) both morning and evening - a reward for drinking milk in the morning and a reward for drinking milk in the evening
Reference: Muslim 2358