IshPs 2(7) :ܘܡܢ ܗ݀ܘ ܙܒܢܐ ܫܪܝܬ ܕܬܗܘܐ ܡܙܕܡܪܐ ܬܫܡܫܬܐ‏ : from that time the service began to be sung
See the entire entry for ta/ešmšā, ta/ešmeštā n.f. ministry, service; use