Ps-Clem Hom 11.280:17 :ܐܝܢܐ ܕܡܢ ܠܓܘ ܕܟ݂ܐ ܐܦ ܒܪܝܘܬܗ ܡܫܟܚ ܠܡܕܟܝܘ‏ : that which is clean on the inside, it is also possible to clean its outside
See the entire entry for barrāyū, barrāyūṯā n.f. outside