1Esdras(3 Ezra) 5:56 :ܘܐܩܝܡ ܠܠܘܝ̈ܐ ܡܢ ܒ̈ܢܝ ܥܣܪ̈ܝܢ ܫ̈ܢܝܐ ܥܠ ܥܒ̈ܕܐ ܕܡܪܝܐ‏ : he set up the Levites from 20 years old for the Lord's works
See the entire entry for lywy adj. Levite