P Num22:27 :ܘܚܙܬ ܐܬܢܐ ܠܡܠܐܟܗ ܕܡܪܝܐ܂ ܘܪܒܥܬ ܬܚܝܬ ܒܠܥܡ‏ : the she-ass saw the Lord's angel and lay down under Balaam
See the entire entry for rbˁ vb. to lie down