GregOr 41 29.2.42 :ܙ݁ܕܩ ܓܝܪ ܕܬܡܢ ܢܫܬ݁ܠܡ ܫܘܒܬܐ ܕܗܪܟܐ ܕܢ̈ܦܫܬܐ‏ : for it is proper that there the Sabbath of the here-and-now of the souls should be perfected
See the entire entry for šabbā{šubbā), šabbəṯā (šubbəṯā) n.f. sabbath; week