For Hammurabi, see Laws of Hammurabi section 170; for Mari, see G. Boyer, Archives Royales de Mari, 8, Text No. 1; for Nuzi, see E. A. Speiser, Annual of the American Schools of Oriental Research 10 (1930), pp. 8, 35, 39; and for Neo-Babylonian laws, see Pritchard, Ancient Near Eastern Texts, p. 198.