P Is1:25 :ܐܨܪܘܦ ܡܪ̈ܘܕܝܟܝ ܠܕܟܝܘ܂ ܘܐܥܒܪ ܥ݁ܘ̈ܠܝܟܝ ܟܠܗܘܢ‏ : I shall cleanse your impieties until pure and eliminate all your iniquities
See the entire entry for ṣrp vb. to refine; to tighten