In Gbaya, the notion of «a nation far away» and «a people at the ends of the earth» that «come swiftly and speedily» in Isaiah 5:26 is emphasized with mɛtɛ̧ɛ̧-mɛtɛ̧ɛ̧, an ideophone used to describe a large number leaving a place in groups.
Ideophones are a class of sound symbolic words expressing human sensation that are used as literary devices in many African languages. (Source: Philip Noss)