IshPs 35(2) :ܘܟܘ̈ܠܝܬܐ ܠܚܘܫܒ̈ܐ܃ ܒܗ݀ܝ ܕܗ݂ܢܘܢ ܡܘܠܕܝܢ ܠܙܘ̈ܥܐ ܕܪܓܬܐ ܕܢܨܝܒܐ ܒܟܝܢܢ‏ : (he calls) the thoughts kidneys, inasmuch as they give rise to the faculties of the desire that is planted in our nature
See the entire entry for kōlī,kōlīṯā n.f. kidney