EphNis 40:1.5 :ܕܝܘܠܦܢܐ ܐܢܐ ܠܩܢܘܡܝ ܗܘܝܬ ܪܒܐ‏ : I was my own teacher of learning
See the entire entry for raḇ, rabbā n.m. chief; teacher