1 Samuel 1:7

When she went — This circumstance is noted as the occasion of the contention, because at such times they were forced to more society with one another, by the way, and in their lodgings; whereas at home they had distinct apartments, where they might be asunder; and then her husband's extraordinary love and kindness was shewed to Hannah, whereby Peninnah was the more exasperated; then also Hannah prayed earnestly for a child, which hitherto she had done in vain; and this possibly she reproached her with. Did not eat — Being overwhelmed with grief, and therefore unfit to eat of the sacred food. Which they were not to eat in their mourning.