What is the tradition of ethnic minorities that the right hand is a clean and holy hand that takes food?

It is the tradition of Hui minority that the right hand is clean and holy to take food. According to relevant data, this is a tradition of Hui people, who always hold food with their right hand. Hui nationality is a minority with a large population in China, which is distributed in 3/kloc-0 provinces, autonomous regions and municipalities directly under the central government.