OS MkSin7:21 :ܡܢ ܠܒܐ ܗܘ ܓܝܪ ܢܦܩܢ ܡܚܫܒܬܐ ܒܝܫܬܐ‏ : for evil thoughts come from the mind
See the entire entry for leḇ, lebbāˀ n.m. heart; mind