Ps-Clem Hom 11.286:5 :ܘܟܕ ܩܨܐ ܐܘܟܪܣܛܝܐ ܠܡܪܗܘܢ ܡܩܒܠܢܗ‏ : we he broke the bread of the eucharist for their Lord who receives it
See the entire entry for qṣy vb. to break and separate