IshGen 40:5 :ܗ݀ܘ ܡܐ ܓܝܪ ܕܫܡܫܐ ܥܒ݁ܕ ܒܬܪܥܣܪ ܝܪ̈ܚܐ ܕܫܢܬܐ܃ ܗ݂ܘ ܗܢܐ ܥܒ݁ܕ ܣܗܪܐ ܒܥܣܪܝܢ ܘܬܫܥܐ ܝܘ̈ܡܝܢ ܘܦܠܓܗ‏ : for that which the sun does in the year's twelve months, the moon accomplishes the same thing in twenty nine and a half days
See the entire entry for ˁbd vb. to make, act, do