It was narrated from Khubaib bin ‘Abdur-Rahman that his paternal aunt Unaisah said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: ‘When Ibn Umm Maktum calls the Adhan, eat and drink, and when Bilal calls the Adhan, do not eat nor drink.” (Sahih)