It is also said that Sarah was motivated by Ishmael's sexually frivolous ways because of the reference to his "making merry" (Gen. 21:9), a translation of the Hebrew word "Mitzachek". This was developed into a reference to idolatry, sexual immorality or even murder; some rabbinic sources claim that Sarah worried that Ishmael would negatively influence Isaac, or that he would demand Isaac's inheritance on the grounds of being the firstborn. Regarding the word "Mitzachek" (again in Gen. 21:9) The Jewish Study Bible by Oxford University Press says this word in this particular context is associated with "Playing is another pun on Isaac's name (cf. 17.17; 18.12; 19.14; 26.8). Ishmael was 'Isaacing', or 'taking Isaac's place'." Others take a more positive view, emphasizing Hagar's piety, noting that she was "the one who had sat by the well and besought him who is the life of the worlds, saying 'look upon my misery'".