Syr-RomLaw.43.9 :ܐܢ ܢܚܘܐ ܗ݀ܘ ܕܐܨܚ ܕܝܐܬܝܩܝ܃ ܘܐܚܪܬܐ ܕܝܐܬܝܩܝ ܐܬܪܥܝ ܕܢܨܚ܃ ܠܐ ܫܪܝܪܐ ܗ݀ܝ ܕܐܨܚ‏ : should someone who wrote a testament demonstrate that he wanted to write another testament, the one he wrote is not valid
See the entire entry for ṣḥḥ#2 vb. C to write