AphDem6.133:2 :ܢܦܫ̈ܢܐ ܡܟܬܪܝܢ ܥܠ ܐܪܥܐ ܒܢܛܝܠܘܬܐ ܕܦܓܪ̈ܝܗܘܢ ܘܗܦܟܝܢ ܠܗܘܢ ܠܫܝܘܠ‏ : animate ones stay on the Earth through the heaviness of their bodies and then return to Sheol
See the entire entry for naṭṭīlū, naṭṭīlūṯā n.f. heaviness