The aim of this study is, on the one side, to inquire into the meaning of the expression in Deut. viii 3b. Because this expression appears only once in the Old Testament, this study investigates the genitival construction in Num. xxx 13; Deut. xxiii 24; Jer. xvii 16, and Ps. lxxxix 35, and the expression in Num. xxx 3; Judg. xi 36; Isa. xlv 23; and lv 11. One may conclude that these expressions bear signs of a juridical language, with the connotation of `self commitment'. Accordingly, in Deut. viii 3b denotes the self commitment of YHWH.