OS MtCur18:6 :ܦܩܚ ܗܘܐ ܠܗ ܕܬܗܘܐ ܬܠܝܐ ܪܚܝܐ ܕܚܡܪܐ ܒܨܘܪܗ‏ : it would be better for him that a donkey's millstone were hung on his neck
See the entire entry for ḥmār, ḥmārā n.m./f. ass