OS MtSin15:14 :ܣܡܝܐ ܕܝܢ ܕܠܣܡܝܐ ܡܕܒܪ ܥܡܗ ܒܓܘܡܨܐ ܢܦܠ‏ : a blind man who is leading another blind man will fall into a pit
See the entire entry for gummāṣ, gummāṣā n.m. pit