Reading the three instances of the wife-sister motif in (a) (b) and (c) Speiser argued that in a work by a single author, these three cases would present serious contradictions: Abraham would have learned nothing from his narrow escape in Egypt, and so tried the same ruse in Gerar; and Abimelech would have been so little sobered by his perilous experience with Abraham and Sarah that he fell into the identical trap with Isaac and Rebekah. Speiser concluded (on independent grounds) that the Jahwist was responsible for incidents (a) and (c), while the Elohist was responsible for incident (b). If the Elohist had been merely an annotator of the Jahwist, however, the Elohist would still have seen the contradictions for Abimelech, a man of whom the Elohist clearly approved. Speiser concluded that the Jahwist and the Elohist therefore must have worked independently.