Commentary for Berakhot 60:15

<big><strong>גמ׳</strong></big> מנא ה"מ א"ר אלעזר דאמר קרא (שמואל א א, י) והיא מרת נפש

GEMARA Whence is this teaching derived? R. Eleazar said : For the Scriptures state, "She was in bitterness of soul and prayed unto the Lord" (I Sam. i. 10).

Abraham Cohen Footnotes to the English Translation of Masechet Berakhot