IshExod 50:8 :ܡܕܝܢ ܬܠܬܐ ܡܕܡ ܡܫܘܕܥ ܫܡܐ ܕܚܘܣܝܐ܂ ܥܠ ܛܣܐ ܘܥܠ ܦܪܝܣܐ ܘܥܠ ܚܘܣܝܐ ܕܚ̈ܛܗܐ ܕܗ݀ܘܐ ܒܡܨܥܝܘܬܗܘܢ‏ : thus the word ḥ' indicates three things: a metal plate, a spread cover, and the reconciliation of sins achieved by means of them
See the entire entry for ḥussāy, ḥussāyā v.n.D propitiation