P 2K3:27 :ܘܢܣܒ ܠܒܪܗ ܒܘܟܪܗ ܕܗܘ ܡܡܠܟ ܒܬܪܗ܂ ܘܐܣܩܗ ܥܠܬܐ ܥܠ ܫܘܪܐ‏ : he took his firstborn son, who was to rule after him, and offered him up on the city-wall
See the entire entry for bŭḵur, buḵrā n.m. firstborn