IshPs 40(11) :ܥܠ ܕܕܡ݁ܐ ܠܗ݀ܘ ܫܡܝܐ ܕܠܥܠ ܟܐܢܐܝܬ/ܦܐܝܐܝܬ/ ܐܬܩܪܝ ܫܡܝܐ‏ : since it is like the sky on high it was naturally/properly/ called "sky"
See the entire entry for payāˀīṯ adv. well