1 Sam 1:11

וַתִּדֹּ֨ר נֶ֜דֶר וַתֹּאמַ֗ר יְהוָ֨ה צְבָא֜וֹת אִם־רָאֹ֥ה תִרְאֶ֣ה בָּעֳנִ֣י אֲמָתֶ֗ךָ וּזְכַרְתַּ֨נִי֙ וְלֹֽא־תִשְׁכַּ֣ח אֶת־אֲמָתֶ֔ךָ וְנָתַתָּ֥ה לַאֲמָתְךָ֖ זֶ֣רַע אֲנָשִׁ֑ים וּנְתַתִּ֤יו לַֽיהוָה֙ כָּל־יְמֵ֣י חַיָּ֔יו וּמוֹרָ֖ה לֹא־יַעֲלֶ֥ה עַל־רֹאשֽׁוֹ׃

And she made a vow, pleading, “O LORD of Hosts, if only You will look upon the affliction of Your maidservant and remember me, not forgetting Your maidservant but giving her a son, then I will dedicate him to the LORD all the days of his life, and no razor shall ever come over his head.”