The article is concerned with a textual and historical examination of Ps. lxxviii 9. It begins by considering the history of exegesis of this Psalm, after which it considers in depth the only attested textual variant to the reading of the verb n⋅q, namely, nq⋅. Having concluded the investigation of the textual variant, the work then carries on to consider the reliability and integrity of the Hebrew text. It achieves this objective by a consideration of 11QPsd, which is followed by a consideration of the Septuagint's text. Next in turn for an evaluation of its contribution is the text of the Targum, which is considered at length. Since Rashi often bases his exegesis on the Targum it has been thought best to consider his exegesis of this difficult verse. The final part of the article is concerned with the cumulative assessment of all the pieces of textual evidence thus considered.