Ps-Clem Recogs 1.44:22 :ܟܕ ܐܦ ܝܕܥܬܗܘܢ ܕܗܢܘܢ ܙܥܘܪ̈ܐ ܡܬܥܡܛܐ ܗܘܬ ܡܢ ܟܢܫ̈ܐ ܗܢܘܢ ܕܕܠܩܘܒܠܐ ܪ̈ܢܝܢ ܗܘܘ‏ : while even the knowldege of those few was obscured by those groups who were thinking otherwise
See the entire entry for ˁmṭ vb. to be darkened