IshGen 21:5 :ܚܦܝ ܐܠܗܐ ܡ݂ܢ ܒܢܝ̈ܢܫܐ ܥܕܡܐ ܠܗܓܪ ܕܐܝܬ ܚܝ̈ܠܘܬܐ ܪ̈ܘܚܢܐ‏ : up until Hagar God kept hidden from mankind that there were spiritual powers (i.e., angels)
See the entire entry for ḥpy vb. to cover