P Ex28:4 :ܘܢܥܒܕܘܢ ܠܒ̈ܘܫܝ ܩܘܕܫܐ ܠܐܗܪܘܢ ܐܚܘܟ ܘܠܒ̈ܢܘܗܝ ܠܡܟܗܢܘ ܠܝ‏ : let them make sacred garments for your brother Aaron and his sons to serve as priests for Me
See the entire entry for khn vb. D to serve as priest