JSmem 9:149 :ܩܲܕܡ ܦܠܦܠ ܐܝܕ̈ܘܗܝ ܒܕܡܐ ܕܢܗ݂ܘܐ ܐܝܕܥ‏ : he first stained his hands with blood so that it would be a sign
See the entire entry for yəḏaˁ, yadˁā n.m. information, sign