Sistrum

The sistrum's basic design, a metal frame on a handle strung with loose discs or bars that rattle against each other when shaken, was already old in ancient Egypt, where it was closely associated with the goddess Hathor and appears in temple reliefs held by priestesses and by royal women performing rites in her honor; the instrument's rattling sound was understood within that cult as pleasing and appeasing to the goddess and to other deities by extension. That specific religious history is Ancient Egyptian Religion's to tell in full.

What is notable from the far side of the timeline is that the same basic instrument, under the name tsenatsil, remains in active liturgical use today, three thousand years later and in a religion with no doctrinal connection to Hathor at all: the Ethiopian and Eritrean Orthodox Tewahedo churches, whose deacons and cantors shake the tsenatsil, usually alongside drums and prayer staffs, during the sung portions of the liturgy. Scholars generally treat the continuity of the physical instrument, rather than any claimed continuity of belief, as the connecting thread, an unusually direct material survival of an object from one religious world into an entirely different one.

In Ethiopian and Eritrean Orthodox worship, the tsenatsil is a working liturgical instrument rather than a museum survival treated as a curiosity. It is shaken rhythmically by deacons and by the cantors known as debtera during the chanted and hymned portions of the service, particularly within the distinctive Ethiopian liturgical music tradition attributed to the sixth century saint Yared, and it typically appears alongside the kebero, a large drum, and prayer staffs used both for rhythm and, during long services, as something worshippers lean on. Its role is percussive and structural, marking the beat of the chant much as a timeline bell does in other traditions, rather than melodic.

The tsenatsil's continued central place in Ethiopian and Eritrean Orthodox liturgical music, alongside its startlingly long documented pedigree stretching back to ancient Egyptian temple practice, makes it one of the clearest examples in devotional instrument history of an object outliving, by millennia, the specific belief system that first gave it a religious purpose. Ethiopian church communities outside Ethiopia and Eritrea, including diaspora congregations in North America and Europe, have kept the tsenatsil in regular use as well, treating it as one of the clearest audible markers of continuity with home practice.