From Sahih Muslim (Hadith 4897):
It has been narrated on the authority of Abu Mas'ud al-Ansari who said A man brought a muzzled she-camel and said:It is (offered) in the way of Allah. The Messenger of Allah (ﷺ) said: For this you will have seven hundred she-camels on the Day of Judgment all of which will be muzzled
Reference: Muslim 4897