IshPs 158(9) :ܠܘ ܡܬܚܡܐܝܬ ܐܡܪܗ݀܃ ܐܠܐ ܕܠܥܠܡܝܢܐܝܬ ܡܩܘܐ ܫܘܠܛܢܗ‏ : he did not say that it was fixed, rather his rule lasts forever
See the entire entry for məṯaḥmāˀīṯ adv. in a determined, fixed manner