Yossi Feintuch: Thoughts on the Hannah narrative (1S,1)
Though she gave birth to several children P'ninah — Hannah's co-wife — taunted her for Hannah remained Elkanah's beloved. P’ninah's taunting is reminiscent of Hagar, who upon her quickly-becoming-pregnant exhibited an arrogant attitude towards Sara, her mistress, at whose demand Abraham took Hagar as a wife for progeny.
