Shama-il Tirmidhi Chapter 9, Hadith Number 1 (69).

Buraydah (radiallahu anhu.) says, “Najaashi sent two simple black coloured as a gift to Sayyidina Rasulullah sallallahu alaihe wasallam. He wore these and made mash over after performing wudu”.

Commentary.
Najaashi was the title of kings of Abyssinia, like sharif was the title of the rulers of Makkah. The name of this Najaashi was As-hamah, who later became a Muslim. The’ulama have deduced from this hadith that it is permissible to accept a gift of a non- believer. Najaashi had not yet accepted Islaam at the time of sending the gift. The ‘ulama have therefore summed up these in different ways.