CPA Ex19:12 :ܐܣܬ̈ܟܠܘ ܠܓܪܡܟܘܢ ܕܠܐ ܬܣܩ̈ܘܢ ܠܛܘܪܐ‏ : watch yourselves so as not to go up to the mountain
See the entire entry for skl#2 vb. D to understand; Dt to look at