IshGen 7:3 :ܠܡܘܢ ܠܐ ܡ݂ܢ ܡܬܘܡ̈ܘܗܝ ܒܪܗ݀ ܠܒܪܝܬܐ‏ : why did He not always create creation [i.e. God is eternal, why not creation?]
See the entire entry for mṯōm adv. always