OS MkSin13:36 :ܘܠܡܐ ܢܐܬܐ ܡܢ ܫܠܝܐ ܢܫܟܚܟܘܢ ܟܕ ܕܡܟܝܢ ܐܢܬܘܢ‏ : lest coming suddenly he find you sleeping
See the entire entry for šlē, šelyā n.m. quiet, ease