Sahih Bukhari, Hadith: Q6201, (111) Chapter. Whoever, while calling a friend, omits a letter from his name.

صحيح البخاري

Sahih Bukhari

كتاب الأدب

The Book of Al-Adab (Good Manners)

باب من دعا صاحبه فنقص من اسمه حرفا:

(111) Chapter. Whoever, while calling a friend, omits a letter from his name.